How to do Office 365 PST Import while not allowing duplicates

Hi,

We started a PST import to a specific subfolder for a group of users. The PST import failed half-way. Now we notice that the users are having the imported PST in their mailbox but only half of the data. We want to re-try the import but we don't want to overwrite the mails that have already been imported.

On-premises Exchange had a convenient parameter for this but it seems the PST Import service of Office 365 doesn't have this.

We can't delete the folders that have been created by the import because users might have used them already (to store new mail items).

Any ideas?
LVL 1
Jozef WooSystem EngineerAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Tom CieslikIT EngineerCommented:
In process if importing file to Outlook, there is an option to select: Do Not Import Duplicates" or Replace Duplicates with Items Imported

Capture.JPG
1
Jozef WooSystem EngineerAuthor Commented:
Hi Tom, thanks but I know this option. I'm talking about the PST Import service in Office 365.
0
Tom CieslikIT EngineerCommented:
This problem was resolved on EE before.

Bottom line is you need to import all as is then use script to remove duplicates
Please navigate to this question and You'll get your answer

https://www.experts-exchange.com/questions/28952773/Import-PST-to-O365-without-duplicates.html
1

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Making Bulk Changes to Active Directory

Watch this video to see how easy it is to make mass changes to Active Directory from an external text file without using complicated scripts.

Jozef WooSystem EngineerAuthor Commented:
Hi Tom, thanks for your feedback. There is one more solution:

You can trigger the import via PowerShell and use the familiar paramters, here's an example article: https://blogs.perficient.com/microsoft/2016/08/office-365-how-to-import-psts-from-azure-storage-via-powershell/

The same New-MailboxImportRequest cmdlet is used (https://technet.microsoft.com/EN-US/library/4ca9af1a-33fa-4d53-a765-f46a1b7f2d3a(EXCHG.160).aspx).

You need a Premium Azure Subscription though.
0
Jozef WooSystem EngineerAuthor Commented:
There are 3 options:

- Using Outlook
- Importing them anyway and then removing the duplicates
- Using the New-MailboxImportRequest while importing from Premium Azure Storage.
1
Jozef WooSystem EngineerAuthor Commented:
Actually.... the real answer to this question is:

Office 365 PST Import does NOT create duplicates !!! (despite what the Office 365 Support team told me!!!) I tested it myself.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Office

From novice to tech pro — start learning today.