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O365 mailbox is not provisioning

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Andy_Bond
Occasional Contributor

Hi folks,

We have on-premises Active Directory with hosted Exchange server. Mailboxes are stored on-premises, Users are managed on-premises and synced to Office 365 via Azure AD Connect. Configuration is NOT hybrid because of Exchange service provider.

I’m migrating mailbox content from on-premises mailboxes to Exchange online using Bittitan tool.

All users synced successfully, except two.

I noticed that these two users’ mailboxes can’t be synced, because they don’t have cloud mailboxes provisioned.

In the Mail settings of these users I can see message:

This user's on-premises mailbox hasn't been migrated to Exchange Online. The Exchange Online mailbox will be available after migration is completed.

 

Anyone knows how can I make these mailboxes provisioned?

Thanks

 

 

5 Replies
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If the users are properly licensed for exchange it’s probably due to the msexchmailboxGuid attribute!

Read more here:

https://help.bittitan.com/hc/en-us/articles/115008114287-No-mailbox-with-such-GUID-ErrorNonExistentM...

Adam
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Thanks@adam deltinger ,

As this will clear msExchMailboxGuid  for all my users I'll need to re-assign licenses for all of them, right?

What could be other consequences of this?

 

Andy

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Solution
I would set this attribute to null via adsi edit on those two users, then do a sync again! The licenses are already assigned right? They need to be in order to create an online mailbox
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Thanks @adam deltinger  that worked for me!

I cleared the msExchMailboxGuid for both of mailboxes in ADSI , waited for sync and voila.

Mailbox was provisioned straight away for one account, and for another I had to reapply the Exchange online license.

 

It works now and Bittitan successfully synced messages for these mailboxes.

 

Thanks!

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@adam deltinger  Do you know the circumstances under which msExchMailboxGuid can become populated?

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