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Is there any free OST to PST Converter?

Smith Daniel
Smith Daniel asked
Last Modified: 2018-05-26
Is there any free solution to convert Exchange OST file emails to Outlook PST format. As I searched on google where I am getting various third party software recommendation but I want to know any free OST file conversion solution.
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Adam BrownCloud Security Consultant
Top Expert 2010

There aren't, sadly. In order to do that type of file conversion, software developers must first pay licensing fees to MS, which precludes any kind of free solution.
Raneesh ChitootharayilRaneesh (raneeshcr)
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Christ HaroldSoftware Engineer
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viktor grantExchange Servers

Hi Smith,

You can try Outlook to convert OST to PST. You need to have Outlook in Offline mode, import the OST. Start a backup of Outlook. You should have the PST files

You have this tool too:


Pete LongTechnical Architect
Distinguished Expert 2019

If its just a couple use Outlook, I'm assuming your asking because you have a LOT to do?
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Sandeep KumarAssociate Consultant

There are manual methods available if you want to export Exchange OST file to PST file like Import/Export methods or Using ‘Archiving’ to save OST emails to PST. Both methods are defined at https://www.nucleustechnologies.com/blog/free-methods-convert-ost-to-pst-file/

If you want automated tool for OST to PST conversion, then refer to Kernel for OST to PST Converter tool. Visit: https://www.nucleustechnologies.com/ost-to-pst-converter.html to know more about the tool and download the demo version. Through demo version, you can convert 25 items from each folder of OST file. Give it a try.
i have try both above both tool but there is a limit of conversion you can try this tool they said there is no limit of conversion but i havn't try this tool http://www.msoutlook.org/convert-ost-to-pst-file/
Technical Expert
Top Expert 2014
This one is on us!
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Perfect Data Solutions provides free version of OST to PST Converter that makes conversion process easier and faster. Free version convert only 20 emails per folder into all supported formats.


Thanks for your help..

As I see all suggestion are paid, but free demo of these tool is not sufficient for my requirement.
Brian BEE Topic Advisor, Independent Technology Professional

As was said, there is no free version that will fully do it, just free demos. Then again, why do you need to do this? Maybe there is a better way to accomplish what you want. Using PST is not a good idea unless you have to. See here:

Marshal HubsEmail Consultant

You can use Stellar OST to PST Converter to convert ost file to pst format. In demo version, you can preview your mailbox data and save 20 emails per folder for free. For more information, please check this link: https://www.stellarinfo.com/convert-ost-to-pst.php


Here are some ways you can try to convert OST to PST.

1.  You can copy all the contents in the ost file to the pst file in Outlook manually. But for that, you need make sure that you can open the ost file to get all the contents. And you can also just export the content in ost file to pst file in outlook. More details at


2.   If you can access the Exchange server with the the OST file, you can use Export-Mailbox command to export the data into a PST file. Below is the detalis:


3. Or maybe you can try to use VBA code to do the conversion automatically. Here is an articel about this. Hope it helps.

There's no freeware tool that can convert OST to PST format. But if you're looking for a free solution, you can try some easy manual tricks. This article contains some useful information about how to import mailbox content from OST to PST format manually - semnaitik.com/convert-ost-to-pst/

Since there's no way to convert OST to PST format at free of cost, you should try to import the mailbox content from OST to PST file by using the built-in features of MS Outlook, such as Archive, Export to a new PST file, Move the items to a new PST file, Drag & Drop. You can find the complete information in the above article.

MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Please consider other posts  as well which helped the asker when initiating the auto-close as it will help others in future.
Appreciate your cooperation and understanding.
Edwin HofferTechnical Expert
Top Expert 2014

Free solution is not available so please close this thread with all possible answers.
Take Regain OST to PST Converter software which easily repair all faults from inaccessible OST file and restore OST file. It can also easily restore inaccessible OST database along with meta-tag (To, Cc, Bcc, Subject, Data, Time, Attachments) and successfully Convert OST to PST, EML, MSG, that can be read in Microsoft Outlook.

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