[Quick Fix] ExchangeGUID Does Not Correctly Update (2021)

The strategies in this post help you to solve the ExchangeGUID does not correctly update issue.

I had a bad day where in the user account licensed with Exchange Online Plan 2 but no mailbox is provisioned in cloud and on-premises assocuated as a remote user mailbox.

I have updated the ExchangeGUID of the affected mailbox in on-premises to null (00000000-0000-0000-0000-000000000000) to see how it works. Sadly, the steps didn’t work and the ExchangeGUID in on-premises keep on changing on it’s own for some reason. Take a look at the screenshot for better understanding.

As you can see the ExchangeGUID appears different initially so I updated into null but the changes did not update without my action. I thought to try the same steps after 24 hours but no luck. Finally, I decided to try the ADAC (Active Directory Administrative Center) to update them.

• Go to “Active Directory Administrative Center“
• Select “Global Search“
• Search the affected user account
• Click “Properties” on the right

• Select “Extensions” on the left
• Select “Attribute Editor“

• Select “msExchMailboxGuid“
• Select “Clear“

Once this is done, check the status in via Powershell to make sure this is working.

Let’s wait for a few hours for this changes to reflect in cloud. Once it is synced, remove the Exchange Online Plan 2 license and wait for 15 minutes and add it back. Guess what? Exchange GUID does not correctly update issue has resolved. Woohoo!!

Want to improve your Exchange Online experience for better productivity? Check out the tips and tricks mentioned here.

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