Failed PST import Exchange Online

Todays post deals with the Failed PST import Exchange Online 👍

The issue:

When importing PST files into Exchange Online you get given the error

“The operation couldnt be performed because the email address matches multiple entries”

Failed PST import Exchange Online

This error happens for a few reasons, in this case it happened because the mailboxes in question had been previously deleted and recreated, Exchange still holds the softdeleted data of the old mailboxes so giving only the name in your mapping file is no good as it cant tell where you want to put the data.

Failed PST import Exchange Online

 

The resolution:

Log into your tenancy via Powershell using your favoruite method and run the following command for each mailbox:

Get-Mailbox -Identity “Info” | Format-List GUID (Info is the name of your mailbox)

Failed PST import Exchange Online

This will spit out the GUID for the mailbox which is unique and if pointing the mapping file to this it can no longer get confused.

Failed PST import Exchange Online

This will now get over the Failed PST import Exchange Online error and import the data into the correct mailbox.

If you are looking how to set up the upload from scratch, you can see Microsoft’s official page on the topic.

For anything Exchange Online related, or anything else, please feel free to get in touch 👍

 

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