[Quick Fix] ExchangeGUID Does Not Correctly Update (2023)

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 but the user has a remote user mailbox in on-premises.

To resolve the issue, I 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 for some reason and the ExchangeGUID in on-premises keeps changing on it’s own. 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 tried the same steps after 24 hours but no luck. Finally, I decided to try the Active Directory Administrative Center (ADAC) 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“
• Click “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.

Now I’d like to hear from you:

Did I miss anything? Or maybe you have a question about something that I covered.

Either way, I’d like to hear from you. So go ahead and leave a comment below.