Exchange 2010 Hybrid - Disabled remote mailbox

 

 

For the missing remote mailboxes repairing you will need to have the ExchangeGUID of those O365 mailboxes. Get-mailbox is the proper ps commandlet in the EXO order to you have these attributes. For the repairing process you do not need to revoke and reassign the used O365 license for the affected users.

Fixing process the following:

1. Recreate the remote mailbox for the affected users

Enable-RemoteMailbox SAMACCOUNTNAME -RemoteRoutingAddress SAMACCOUNTNAME@xxxxxxx.mail.onmicrosoft.com

The remoteroutingaddress will be your tenant mail service domain. If it is done the recreated remote mailbox will have ExchangeGUID attribute with null value. Then you will have to overwrite this with the mentioned ExchangeGUID of the user O365 mailbox.  

2. Fix the remote mailbox ExchangeGUID

Set-RemoteMailbox SAMACCOUNTNAME -ExchangeGUID <Copy from Office365 Exchange GUID>

3. Make manual ADconnect delta sync.

Then your users are able to use desktop outlook again.