Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Share tech news, updates, or what's on your mind.

Sign up to Post

An Outlook data file aka PST is prone to corruption due to various reasons. A corrupt PST file is always inaccessible. Also, you may lose all your crucial mailbox content at any time. So to fix this corruption and protect the mailbox content from being lost, you should repair PST file. Learn how...!
Free tool for managing users' photos in Office 365
Free tool for managing users' photos in Office 365

Easily upload multiple users’ photos to Office 365. Manage them with an intuitive GUI and use handy built-in cropping and resizing options. Link photos with users based on Azure AD attributes. Free tool!

Though there are a few manual ways to import PST files to Office 365, third-party PST to Office 365 import tools are preferred over them due to various reasons.  Consequently, many tools or services are available for the same. Here, we pick the top 4 ones:

  1. Kernel Import PST to Office 365 Tool
  2. 4Team PST Migration services
  3. BitTitan PST to Office 365 Migration Wiz
  4. NetMail PST to Office 365 migration services

Kernel Import PST to Office 365 Tool

Import PST to Office 365 Tool is reliable in all aspects. It can import PST/OST files to Office 365 mailboxes quickly without losing any data. The entire process completes in just 4 steps. Also, it allows you to map PST mailboxes manually or by a CSV file to the required Office 365 mailbox. Using this tool, you can import emails, calendar, task, journals and other items of each mailbox to office 365. You can also apply filters to PST data before importing it to Office 365 mailbox.

Note: You can import PST to a single mailbox using its Office 365 account. Also, you can import PST to multiple mailboxes using an Office 365 account with Global Administrator credentials.

4Team PST Migration Services

With the use of this 4Team PST Migration services, you can import PST files and OST files to Office 365. You can also import multiple Outlook profiles to the Office 365 account. While using the import services, you do not have to worry about anything else. Another advantage is that their service can be used for migrations involving many other applications like Gmail, Exchange, etc.

BitTitan PST to Office 365 Migration Wiz

BitTitan PST Office 365 MigrationWiz can migrate PST mailboxes and public folders to Office 365. This process has zero downtime and zero impact on end users. This tool also provides complete security to data while you are using this MigrationWiz. However, this tool is complicated to use, and so novice users cannot use it.

NetMail PST to Office 365 migration services

NetMail offers PST to Office 365 import services. They offer to eliminate security risks and provide you well-secured data without any loss or any change in it. So, it helps to deal with all the import-related issues and access PST files in Office 365 quickly. It is a reliable and affordable way to import PST to Office 365. You can use it without worrying about any technical details.

Final Verdict

If you want to avoid manual methods for importing PST files to Office 365, you will have to try third-party tools. Here, we have listed the top 4 tools for importing PST to Office 365 - you can use any of them. But if user-friendliness is your first consideration for selecting the tool, you should choose Kernel Import PST to Office 365 tool. It is very efficient in importing PST files to Office 365.

Configure external lookups on for external mail flow on Exchange 2013 and Exchange 2016.

With the emergence of Office 365 as a superior email communication platform, many organizations have started switching over to it.  After migrating to Office 365, sometimes users, as well as organizations, will have to import PST files to Office 365 for various reasons. There are manual methods as well as professional tools available for importing PST files to Office 365. Here, I will show how you can quickly import PST files to Office 365 without losing data. We have two methods for the same:

  1. Network Upload Method
  2. Kernel Import PST to Office 365

Network Upload Method

Network Upload method is a manual way to import PST files to Office 365 mailboxes. You can use this method when you have good technical knowledge. The steps are:

  1. Download & install AzureAzcopy and copy SAS URL: Initially, you have to download and install the AzureAzcopy tool. For this, you have to log in to your organization’s Office 365 account using administrator credentials.  You have to choose either you want to upload your data, or you want to ship it physically.
  2. Upload PST files to Office 365: Now you can run the AzureAzcopy tool. Make sure that your PST file is located on a file share or file server in your organization.
  3. Preview your uploaded PST files: This is an optional step. If you are going to view your uploaded PST files, then you have to download and install Microsoft Azure Storage Explorer. Using it, you can preview the PST files.
  4. Map your PST file to Office 365 mailboxes: Once the PST files are successfully uploaded to the cloud storage, the next thing you have to do is to create CSV file. This CSV (a sample can be downloaded) maps PST files with Office 365 mailboxes.
  5. Create a job to import PST files: Now create a job that can import PST to Office 365. In this step, you can use the CSV mapping file you have created in the previous step.
  6. Set filters and start your import job: Once you have created the job, Office 365 analyzes data and allows to set filters on data before importing it to Office 365. Apply filters as per your need and then start your import job.

Disadvantages of Network Upload Method

The Network Upload method is very complicated, and it requires much technical knowledge. So, it is not reliable for non-technical users. And there are chances of data loss. To overcome all these issues, you should use a third-party tool.

Kernel Import PST to Office 365

Kernel Import PST to Office 365 is designed to import single or multiple PST files to Office 365. You can use either an end user account (for importing to a single/archive mailbox) or an Office 365 account (for importing to multiple mailboxes under this account).

  • Efficiently imports healthy PST/OST files to cloud platform of Office 365.
  • Allows to map PST files with Office 365 mailboxes - manually or using CSV.
  • Enabled with inbuilt filters to segregate data before migration.
  • Option to save PST mailbox hierarchy to a separate folder in Office 365 mailbox.
  • Allows using CSV file to import PST files to multiple Office 365 mailboxes.
  • Provides a summary of import process (can be saved in CSV file).

Import PST to Office 365 using Kernel Import PST to Office 365

Kernel Import PST to Office 365 is an easy to use the tool. To import PST files to Office 365, you can follow the steps: 

  1. Launch the Kernel Import PST to Office 365 tool
  2. Add PST file as the source: The tool allows you add one or more PST file as the source. You can click the Add button and select the PST files from any location. If needed, you can also select OST files also as the source.
  3. Add Office 365 account as the destination: Now you can add an Office 365 account (user account or admin account) as the destination. Here, you have the option to migrate Single/Archive mailboxes or migrate multiple mailboxes in a single attempt. And with Office 365 global admin account, you can view the list of all the mailboxes under this account. You can also map PST files with corresponding Office 365 mailboxes as per your requirement.
  4. Apply filters and start migration: In this step, you are allowed to perform the selective migration. You can apply filters to your PST data before migration. You can also exclude empty and Deleted folder from migration. Once you have applied filters, then you can start migration.
  5. Save the PST import report: Once the PST import process is complete, the software displays the summary of the entire process. You my save this report to a CSV file.

Network Upload Method Vs. Kernel Import PST to Office 365 tool

Network Upload Method
Kernel Import PST to Office 365 Tool
Lengthy and complicated procedure.
Simple procedure – only 4 steps
Imports only PST files
Imports PST & OST files
Need to download and install AzureAzcopy tool and copy SAS URL
Does not require any other tool.
Filters PST data by age, type, and owner.
Filters mailboxes by Date Range, Item Type, Folders. Can exclude empty folders & Deleted folder.
CSV based mapping only
Allows manual and CSV based mapping

Gmail by Google
Read this tutorial to learn how to fix repeating password error prompts when setting up Gmail IMAP with Microsoft Outlook. The entire process is described with step by step, illustrated instructions. Enjoy...
If there is anything erroneous with Exchange Database, it causes a significant effect on email communication till the user remounts the database. Further, database crash directly affects Outlook users due to which they are unable to access their emails.
useful tips for Outlook troubleshooting
Outlook is not just an email client. It's a personal information manager that has great features. Sometimes you may confront serious problems which leave you helpless. For a novice user, troubleshooting the problem is not easy. I've listed top 10 tips & tricks here to troubleshoot Outlook problems.

Expert Comment

by:thu huong
Comment Utility
Hotmail was once the most popular email service in the world. However, in the process of developing the internet, the free email service has also grown tremendously. Gmail has beaten Hotmail in the battle with many outstanding features. Although many have used other email services like Gmail, Hotmail has its advantages – more than 1 billion users. Here is how to sign up Hotmail, sign in Hotmail.
This tutorial summarizes the causes behind"an unknown error prevented access to the PST File”. It also suggests the various solutions to fix the problem.
Let us take a look at the scenario, you have a database that is corrupt and you run the ESEUTIL command only to find you are unable to repair it. How do you now get the data back?
Organisation is organized in a pattern to flow the day to day business, every application and system is interdepended on each other and when very important “Exchange Server downtime” happened.
Easily manage email signatures in Office 365
Easily manage email signatures in Office 365

Managing email signatures in Office 365 can be a challenging task if you don't have the right tool. CodeTwo Email Signatures for Office 365 will help you implement a unified email signature look, no matter what email client is used by users. Test it for free!

Check out the easy way to Export Thunderbird to MS Outlook. It can be done effectively by using manual method and if you are not much into coding then you can definitely try the third party tool for the conversion.

Expert Comment

by:Smith Daniel
Comment Utility
The above article is truly helpful. Thanks for sharing. Before purchasing any paid tool, users can try an easy manual trick shared in this article to import email messages from MBOX Mails to Windows Outlook PST.
After a recent Outlook migration from a 2007 to 2010 environment, some issues with Distribution List owners were realized. In this article, I explain how that was rectified.

Office 365 has multiple features and services which are specially designed to help businesses to reduce their dependence on on-premises IT resources. It also offers great flexibility and enhanced security. But like any other data, Office 365 mailbox can also be backed up. Usually, this is done in PST format. And if you want to migrate Office 365 mailbox to Outlook, then also you need to save in PST format. However, there is no special feature available in the Office 365 for this need – but the Office 365 feature eDiscovery can be used to export the Office 365 mailbox to a PST file.

Step-by-step procedure to back up Office 365 mailbox to PST (using eDiscovery tool)

  1. Login to Office 365 and go to Admin center.
  2. In Admin center panel, go to Reports option and click Security & Compliance.
  3. In Security & Compliance center, click the Reports dashboard option which will take you to the dashboard.
  4. Click Permissions. It will have multiple tools listed. Among them is eDiscovery Manager tool which will export the Office 365 mailbox to PST. Check it, and then click Edit role group.
  5. Now, go to Choose eDiscovery Manager where you need to choose a single or multiple accounts which will have the authority to export the mailbox.
  6. Click Add.
  7. Choose accounts, and click Add.Click Done.
  8. Click Save.
  9. Now, go to Search & Investigation. Here, choose the Content search option. Click the (+) button to add new Search content.
  10. Input name of the search content, and choose the desired options from where you want to search the content.
  11. The next window will let you choose if you want to put a keyword in the search content. But if you want to search the whole content, then leave it empty.
  12. After the search process is completed, the user can easily export the search item in PST format. Click the Start Export option.
  13. In Exports search results window, choose the desired options among the available and click Start Export.
  14. The tool starts exporting data and you can download the download exported results to see the whole migration report.
  15. In Export search results, you can copy the URL which will be used in the eDiscovery PST export tool and paste it there.
  16. Copy the selected URL in eDiscovery PST Export tool, provide a destination to store the migrated data, and click Start Export. The migration will start.

Automated method

If you do not want to go through this tiresome, error-prone, or time taking the process of manually exporting the Office 365 mailbox to PST, then use Kernel Office 365 Backup & Restore which can easily access the Office 365 mailbox and save it in PST format at the user-defined location. Office 365 Backup tool has a highly simplified user-interface which any user with very office 365 credentials can use.


Often, the users face difficulty in accessing Outlook 2016 PST files on Windows 10 computer. One of the reasons behind it is the improper functioning of MS Outlook when the user tries to open it. MS Outlook suddenly stops working, or it will not open, and the chances of losing crucial data or information within the PST file becomes very high.

These problems might occur due to upgradation of Windows, the configuration of Microsoft applications, and many other applications or programs. The issues faced with Windows upgrade include incompatible software or configuration is not up to date, and this could be one of the reasons why PST file is not opening on Windows 10 computer.

Below listed are some common issues that may affect the health of Outlook 2016 PST files:

  • Issue 1: Incompatible programs: Windows operating system receive updates with time. However, installed applications on an operating system are not updated, and faces incompatibility issues take place. Outlook starts to produce errors, especially when MS Office Suite and more specifically Word is not updated.
  • Issue 2: System files or applications are missing: At times, when the system files or application files are missing, Outlook desists from working properly. In many cases, the Outlook application is not installed completely and requires reinstallation for proper functionality.
  • Issue 3: Abrupt system shut down: The sudden shut down of Windows 10 affects Outlook while it is in the process of email transfer. Later, it might start usually and abruptly shut down after opening. 
  • Issue 4: PST file becomes oversized: It is a prevalent problem when the PST exceeds the pre-defined storage space. Hence, Outlook does not read the PST file, and it stops working on a Windows 10 PC.


There are many ways to resolve the inaccessibility issue of Outlook 2016 PST file. To cut the long story short try the suggested fixes.

Manual method to repair PST file

The first aid fix to restore a corrupt PST can be done using the Inbox Repair Tool, ScanPST.exe. Find this inbuilt utility tool on your machine (which is a tool developed by Microsoft to resolve issues related to PST files) and run it. Few simple steps to do this:

  1. Close Outlook properly if it is running
  2. Find and run ScanPST.exe
  3. Browse to locate the PST file or manually type the location or file name (if location unknown)
  4. Launch Outlook and click on File Info Account Setting Data Files
  5. Note file path and file name and Click on Close     OK      Exit Outlook
  6. Launch Outlook and create a new PST in your profile
  7. Drag all the recovered items to the new PST from “Lost and Found” folder

It is an easy process but suffers several limitations like data loss and require technical expertise. Therefore, to overcome these limitations, the recommended fix is to use an Automated method which is best suited for non-technical users as well.

Automated method Third-Party tool for PST repair

In case the above manual method does not work, you can opt for a third-party tool which is another best and straightforward solution to fix such issues. The IT professionals recommend Kernel for Outlook PST Repair tool. Such type of tools offer extensive features to technical as well as non-technical users at ease.

Final words

We recommend the users to first use the inbuilt Microsoft utility first in case of issues with MS Outlook. If the problem still persists, use PST Repair tool to repair MS Outlook data files in a few clicks.


As a matter of fact, Outlook OST files are of much importance in relation to Exchange mailbox. OST files are independent as they are simply copy of data of a user’s mailbox on Exchange Server. Though, if the server’s status is changed or it is damaged, the OST files will not be affected. Due to these files any user can work uninterruptedly during the server downtime in offline mode. Later, when the server is online all the data gets synchronized automatically with the mailbox server.

After understanding the importance of an OST file, are you at a situation where OST file got corrupt and searching for an accurate and efficient solution? The best solution is OST to PST converter software that aims to provide solid results and proves to be helpful. Before moving towards detailed solutions, let’s discuss the errors and reasons behind them.

The regular users of Outlook might come across OST file corruption or accidental file deletion issues. This indeed is not a common problem, but if it takes place then it can be worse for the entire business. Due to the inaccessibility of OST files while launching MS Outlook, the user is indicated with several pop-up errors, indicating corruption.

The following errors occur when OST files gets damaged, corrupted or inaccessible:

  • Could not find YYYY.ost (business file) in Outlook storage
  • The YYYY.ost is not available in mailbox
  • Errors detected in YYYY.ost, therefore, to fix and repair the file try using Scanost.exe
  • File is not accessible is also an error
  • The OST folder is displayed
  • MS Outlook encounters a problem and exit suddenly

Before suggesting the fixes for the mentioned errors, let’s take a quick look at the primary reasons that may cause these error:

  • Outlook is suddenly terminated while synchronization with Exchange server
  • Sudden system shutdown during Exchange server synchronization
  • Corrupt file system
  • OST is attacked by virus

Repair techniques for OST file

There are many reasons for an OST file to get corrupted and the major errors may occur due to hardware, software and synchronization failures. Here are some repair techniques that can be applied to OST file.

  1. Replace with a backup copy: One of the best suggested techniques is restoring from a backed up copy. Unfortunately, this technique follows some limitations, say for instance, if the backup is not a recent one then all the data saved after the backup will be missing.
  2. Use inbuilt Inbox repair utility: ScanPST.exe and ScanOST.exe are two inbuilt utilities that are offered by Microsoft to help repair minor issues related to Outlook OST and PST files.
    There are some drawbacks with this technique. Firstly, severe corruption issues are not fixed by ScanOST.exe. Secondly, this utility is limited to Outlook version 2007. Hence, not available for above versions.
  3. Clean offline data and recreate: By removing the offline data of OST file, it will help you in eradicating the cause of corruption (up to a level).
    Therefore, clear the OST with the below mentioned steps:
    a. Find the OST file on your system.
    b. Select “Properties” by right clicking on the folder.
    c. Choose “Clear Offline Items”.
    d. Click “OK”. And, Outlook will be launched.
    e. From the Outlook 2010 ribbon click the Send/Receive tab and click “Update Folder”.
    Later, delete the OST file after completing the above steps and a new OST will be created and data will get downloaded to it within the Exchange mailbox. Overall this method is not a guaranteed one, but is very effective with minor data loss only in conditions where the OST gets corrupted before the merging of Exchange mailbox.
  4. Use OST to PST converter: This is the most reliable technique offered if none of the above techniques work. Data recovery tool is the most intelligent solution for all corruption issues related to OST file. The most efficient recommended tool by experts is Kernel for OST to PST converter – It is a third party tool that helps users in extracting  data from a OST file into PST format.

Final words

The files you backed on the fly always helps when you face any type of data crashes. Although, it is not a hundred percent solution to solve issues of crashes or corruption of OST files. In such cases, if the manual and free methods fails to work, try using  OST to PST Converter software which will effectively convert your corrupt and large size OST file into MS Outlook PST file format.

LVL 26

Expert Comment

by:Brian B
Comment Utility
Why not just delete the OST file and let Outlook create it? It is only a cache file and not required for Outlook to operate. It will be rebuilt the next time Outlook is run.

Your step 2 is not relevant. ScanPST does not work on an OST file and ScanOST is no longer available: https://support.microsoft.com/en-us/help/983036/the-scanost-exe-tool-is-not-available-starting-with-outlook-2010

As a Microsoft Exchange user, you must have known the importance of an Offline storage table (OST) file. It is nothing new for an Outlook user to be dependent on a .ost file during a server break down or a problematic Internet connection. In such a complicated situation, the OST file comes handy to work in an offline mode.

But a disadvantage that comes with these OST files is that they are very prone to corruption because they are available on a local machine. Following are the different reasons that can result in the corruption of an OST file:

  • Malfunctioning of software or hardware.
  • Synchronization issue between the client and the server.
  • Unexpected shut down of the MS Outlook app.
  • Abnormal or unexpected shutting down of the computer.

Due to such corruption, you may receive error messages saying "The file cannot be used because it was created for a different user".

When such an error occurs, it becomes nearly impossible for the user to access any file.

This error occurs when the OST file stored in your system has reached an unstable state, or you can say that it has been corrupted. The only solution to fix this problem is to export all data of the OST file into the PST format. You can convert OST into PST format manually, and procedure for the same is explained in the next section. This procedure works only when the OST is not corrupt. If it is corrupt, then you can repair the corrupt file with the help of a professional OST to PST tool.

How to convert OST into PST format?

Follow the step by step guide given below to convert OST into PST format, and you are good to go.

  • Step 1: Launch the MS Outlook application in your system.
  • Step 2: Now go to the Tools menu > Account Settings. And, now click Email account and select More settings.
  • Step 3: Now select the Advanced tab and then toggle the Use Cached Exchange Mode.
  • Step 4: Now click Offline Folder File Settings and then identify the location of the OST file.
  • Step 5: Restart MS Outlook.
  • Step 6: Now click File > Import and Export. After that click Export to a file and then finally select Personal Folder File (.pst).

Wrap Up

This step guide should enable you to convert the OST file into PST format manually. However, if the procedure mentioned above fails to perform the required conversion, then unfortunately, you are left with only one option, and that is to use a commercial OST to PST Converter tool.

There are plenty of such converter tools available in the market. On the basis of your requirement, you can choose any one of the software to convert the OST into PST. Make sure the software that you will be using is compatible with MS Outlook and Windows version that you are using. You can always try the free or demo version of that software before actually buying it to remove the corrupt OST files present in the system that is creating the inaccessibility error. 


Author Comment

by:Sandeep Kumar
Comment Utility
Hi Brain,

Using a commercial tool is a quick and reliable way to convert OST to PST file, in this scenario. The manual method is only workable when OST file is not corrupt, else there is not point to go for it. Also, manually exporting the file can be problematic if you've large-sized OST files for the conversion, as there can be data integrity issues at the end.
LVL 26

Expert Comment

by:Brian B
Comment Utility
Yes but this article is not about converting OST to PST, it's about recovering from a specific error by rebuilding OST.  Why would you pay for a tool to do that?
Social Network
A few solutions to a problem some of us have been having when trying to add Hostgator email accounts to Outlook 2016 (will probably work with Outlook 2013 as well).

Expert Comment

by:snow white
Comment Utility
Help me to get a safety email

Administrative Comment

by:Mr. Wolfe
Comment Utility
To get  help with your own issue, please click on the blue, "Ask a Question" button at the top of the page.

Mr Wolfe
EE Moderator
Blank message list Outlook 2016 for Mac
I came across an unsolved Outlook issue and here is my solution.

Expert Comment

by:Abhishek Tyagi
Comment Utility
I had to deal with this issue as well. I was able to resolve this by simply renaming the file, Container.plist -> Container.plist.old
This should do the trick, you do not have to rename the entire folder.

Outlook will create a new file on first boot and the issue will be resolved.

I believe this issue is because of the corrupted Container.plist file; probably, this got corrupted during one of the updates.
This article will help to fix the below errors for MS Exchange Server 2016 I. Certificate error "name on the security certificate is invalid or does not match the name of the site" II. Out of Office not working III. Make Internal URLs and External URLs the same IV. Address book download issue
KuppingerCole Reviews AlgoSec in Executive Report
KuppingerCole Reviews AlgoSec in Executive Report

Leading analyst firm, KuppingerCole reviews AlgoSec's Security Policy Management Solution, and the security challenges faced by companies today in their Executive View report.

MS Outlook undoubtedly is the most widely used email client.Its user-friendliness, cost effectiveness, and availability with Microsoft Office Suite make it the most popular email application.  Its compatibility with Microsoft applications like Exchange Server is also a reason for its popularity. However, this application is not completely free of issues. Outlook configuration errors, compatibility issues with other email clients, large size, and corruption of its proprietary file format (PST format), etc. are some common issues faced by Outlook users. However, due to the popularity of Outlook, many professional solutions are available to help Outlook users overcome these issues. Here we will discuss some tools that help you to manage MS Outlook efficiently.

  1. Kernel for Outlook PST Repair – For repairing corrupted PST files
  2. Kernel for PST Compress & Compact – For reducing the size of PST files
  3. Kernel for Outlook Duplicates Remover – For removing duplicate emails from Outlook mailbox
  4. Kernel for Attachment Management – For managing PST email attachments
  5. Kernel for PST Split – For splitting large PST files

Kernel for Outlook PST Repair – For repairing corrupted PST files

PST file corruption is a common issue in all versions of MS Outlook. Some of these issues can be fixed using free or inbuilt tools, but not all. That is why even seasoned Outlook users prefer professional PST repairing solutions. One such a tool you can try is Kernel for Outlook PST Repair. It repairs damaged Outlook Data files.  This tool has many features like:

  • Repairs large PST files without any issues
  • Exports emails to Office 365 and emails servers like Exchange server.
  • Recovers deleted emails & attachments (and displays then in RED for preview)
  • Saves emails to different file formats DBX, MBOX, MSG, and EML, etc.
  • Enabled with inbuilt filters which can find required emails instantly.

Kernel for PST Compress & Compact – For reducing the size of PST files

Kernel for PST Compress & Compact is a unique tool which can compact the size of large PST files. This utility helps you to reduce PST size by removing the unused space. This tool has more features which are stated as follows:

  • Compresses & compacts many PST files in single cycle.
  • Integrated with user-friendly Interface.
  • Compresses or removes attachments from emails.
  • Retains integrity while compacting PST files.
  • Removes extra space from PST files.

Kernel for Outlook Duplicates Remover – For removing duplicate emails from Outlook mailbox

Kernel for Outlook Duplicates Remover is a simple tool to remove duplicate items from the Outlook mailbox. It has different options for finding duplicates in Outlook. Following are the features which are included in this tool:

  • Finds and removes duplicate items from PST files.
  • Inbuilt comparison criteria to find duplicate items.
  • Provides various comparison criteria to find duplicate items.
  • Saves list of duplicate items in HTML format.

Kernel for Attachment Management – For managing PST email attachments

Kernel for Attachment Management is an advanced tool to take backups of the attachments and to remove them from Outlook emails. This tool actually saves space because this tool downloads the PST attachments, save them on local machine and then deletes them from Outlook mailbox. Its features are:

  • Restore attachments to any desired location.
  • Compresses email attachments in zip format.
  • Allows to rename attachments with name prefixes.
  • Maintains a log file with the records of attachments processed.
  • Is compatible with all Outlook versions.

Kernel for PST Split – For splitting large PST files

Kernel for PST Split is a tool for splitting large size PST files. This utility efficiently splits large PST files in just few minutes and saves data into smaller PST files. Splitting PST files eliminates chances of PST corruption and improves the performance of Outlook. More advanced features of this tool are listed below:

  • Splits PST files without impacting original data.
  • Splits password protected PST files
  • Provides various criteria like date range to split PST files.
  • You can give desired size to split PST files.
  • Saves different mailbox folders to separate files as per need.


MS Outlook is the most popular email client. Users find this email client easy to use as its interface is very intuitive. Also, users familiar with other Microsoft products find it very convenient too. However, issues are also frequent with this email application. Many of these issues can lead to inaccessibility of emails, calendar, task list, address book, and more. So users always need some utilities that can help them in managing Outlook without issues.

Today as you open your Outlook, you witness an error message: “Outlook is using an old copy of your Outlook Data File…”. Probably, Outlook is accessing an old OST file.
There can be many situations demanding the conversion of Outlook OST files to PST format and as such, there is no shortage of automated tools to perform this conversion. However, what makes Stellar OST to PST converter stand above the rest? Let us explore the answer to this question.
Mailbox Corruption is a nightmare every Exchange DBA wishes he never has. Recovering from it can be super-hectic if not entirely futile. And though techniques like the New-MailboxRepairRequest cmdlet have been designed to help with fixing minor corruptions within Exchange mailboxes.
Take a look at these 6 Outlook Email management tools which can augment the working and performance of Microsoft Outlook to give you a more rewarding emailing experience.

With so many activities to perform, Exchange administrators are always busy in organizations. If everything, including Exchange Servers, Outlook clients, and Office 365 accounts work without any issues, they can sit and relax. But unfortunately, it is not the scenario in most of the organizations. However, this situation can be improved very much if they try a competent recovery-cum-migration solution in their Exchange environment – Kernel Exchange Suite.

Kernel for Exchange Server – a multifaceted solution for almost all Exchange needs

Kernel Exchange Suite can resolve all the Exchange related issues. If you have this too, you do not need to use different tools for the file recovery (EDB, OST, & PST) and migrations (Office 365 & Exchange). 

  • EDB recovery & migration
  • OST conversion & saving in Exchange/Office 365
  • PST file recovery to various destinations
  • Exchange & Office 365 migrations
  • Exchange backup extractions

When to use Kernel Exchange Suite

Kernel Exchange Suite is a multi-purpose tool for handling various requirements related to Exchange Server, offline EDB files, OST files, Outlook PST files, and Office 365 (Exchange Online). It has many features that are extremely useful for Exchange administrators.

  • EDB & PST File Recovery: This suite can easily recover mailboxes and public folders form EDB files. Also, it recovers emails, calendar, contacts, appointments, lost & deleted emails, etc.from PST files. The recovered data can be saved to Outlook PST files and destinations like Exchange/Office 365. Also, individual emails can be saved to MSG/EML formats.
  • OST to PST Conversion: Exchange OST files residing on user systems is a valuable source of user mailbox data after Exchange crashes and disasters. This suite helps you convert OST files to PST files or to import them directly to Exchange/Office 365. And specific OST items can be retrieved to EML, MSG, file formats.
  • Exchange and Office 365 migrations: By using this suite, you can easily migrate your single or multiple mailboxes to Exchange Server or Office 365. Both the source and the destination data can be viewed on the software console to drag & drop or copy & paste the required data. 
  • Exchange back up extraction: This suite helps to extract your Exchange backups from NT Backup and HP Backup and then restore that to hard disk or you can migrate that into Exchange Server.

Important features of Kernel Exchange Suite

Kernel Exchange Suite provides you many advanced facilities and options for every Exchange related task you have to perform. Unlike the manual methods, all the tasks are performed from a user-friendly interface. Administrators can just glance through the software interface, read the instructions, and choose the options the require, and proceed with the recovery/migration operation.

OST to PST Conversion

This suite can recover mailbox data from OST files (even if damaged or inaccessible) to Outlook PST files. It can recover deleted items too. The OST data can be saved to a new PST file or to an already existing PST file. 

  • Displays the source OST file and destination PST file on the software interface
  • Allows to copy mailbox folders or messages from OST file and paste them into PST folder hierarchy.
  • Copies subfolders and creates a hierarchy in PST file as in the OST file.
  • Filters mailbox data by date range (by specifying a date range).

PST file recovery

Kernel Exchange Suite helps users to fix Outlook issues and PST file corruption issues. It can recover mailbox data from corrupted PST files and save to PST files, Live Exchange, or Office 365 account. 

  • Repairs PST files of all versions of Outlook
  • Before saving, filters mailbox data by date range
  • Allows creating a new Unicode PST file.
  • Imports PST data to Exchange Server and Office 365

EDB recovery and migration

This suite restores EDB data to Outlook PST files without any loss. During recovery, it maintains data integrity as well as the hierarchy within the mailboxes. It also allows users to export their EDB mailboxes to Office 365 accounts and to Live Exchange Server. 

  • Restores EDB mailboxes and public folders to Outlook PST files
  • Splits PST files after the specified size to save the data in multiple PST files
  • Saves EDB mailboxes to Live Exchange Server and Office 365
  • Facilitates selective migration by filtering EDB mailboxes by Item Type & date range
  • Creates operation logs with the details of EDB recovery process

Exchange and Office 365 migrations

Kernel Exchange Suite facilitates migration of single or multiple mailboxes between different Exchange Servers and Office 365 accounts. With this tool, migration is just a copy/paste or drag/drop affair (from the source Exchange/Office 365 to destination Exchange/Office 365).

  • Supports Office 365 & all Exchange versions at the source/destination ends of the migration
  • Administrator can copy mailboxes and paste them to the destination
  • Maps mailboxes between the source and destination for smooth migration
  • Can create new mailboxes in the target from the software interface itself
  • Support all versions of Exchange Server

Kernel Exchange Suite functions as a combination of 4 essential tool for Exchange administrators. It supports EDB files, PST files, OST files, live Exchange, & Office 365 at the source end and EDB files, PST files, live Exchange, & Office 365 at the destination end of recovery/migration operations. So you do not need to use different tools for recovery of EDB, OST, & PST files and Exchange/Office 365 migrations. It is a reliable tool for all Exchange related activities.


Expert Comment

by:Puneet Bhatt
Comment Utility
It seems a nice tool for Exchange email recovery and migration purpose, but I recommend Exchange Toolkit which works fine and because I use it in my last company for all Exchange requirments. Look @ https://www.datarepairtools.com/exchange-toolkit.html
LVL 11

Expert Comment

by:Marshal Hubs
Comment Utility
Stellar Exchange Toolkit allows users:

To repair corrupt EDB files
To extract mailboxes  from EDB files
To extract mailboxes from corrupt BKF files
To convert OST file to PST
To Reset Windows Server Password Recovery

For more information about software features, please check this link: https://www.experts-exchange.com/articles/30936/A-one-stop-solution-for-all-MS-Exchange-Server-issues-from-Stellar-Data-Recovery.html






Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Vendor Experts

Sandeep KumarKernel Data Recovery Learn more about Kernel Data Recovery
Naveen SharmaKernel Data Recovery Learn more about Kernel Data Recovery