Hybrid Exchange Issue

[ITGURU]

I have setup a hybrid environment, exchange 2016 working with Office 365.

If i create a new local user in AD, and create a linked mailbox on the local exchange (as is an exchange resource forest) it creates the mailbox with the 365 domain and can send and receive mail from the local user, or users on 365 can successfully send mail to the user on local exchange.

 

However, if i attempt to move a mailbox from the cloud to local exchange it fails due to ExchangeGUID missing.

 

As the 365 domain users would be in a separate AD forest, how do i move a exchange mailbox from the cloud to local exchange when the local user exists in another cross-forest trust domain, as in the domain which has the exchange server has disabled users for the linked mailboxes.

 

Thanks in advance

[chaplic]

The user you are attempting to move on prem, was it originally created on prem? I'm guesssing no, hence why no guid? In which case you can manually transplant it from O365 to the resource forest domain AD object which I think should work.

 

If my guess isn't correct, how are you syncing user atributes to O365 from your resource and AD forests, there is guidance on how that should be done.

[ITGURU]

The user you are attempting to move on prem, was it originally created on prem? I'm guesssing no, hence why no guid? In which case you can manually transplant it from O365 to the resource forest domain AD object which I think should work.

 

If my guess isn't correct, how are you syncing user atributes to O365 from your resource and AD forests, there is guidance on how that should be done.

 

No, mailbox has never been on-prem. I did manually edit the MailboxGUID property of the user and re-attempt the transfer shortly after but still came up with the same message.

May have to see if can find some other details online.

Alternatively, i'm maybe thinking of creating linked users with fresh mailboxes on the local exchange then export the psts from 365 and bulk import and merge with the local mailbox account, which i presume should work.

[chaplic]

First I would create a mailbox on prem, migrate it to O365 then migrate it back just to check a 'normal' setup is working

 

The account you are trying to move, from memory, should have the following values in AD (confirm by reviewing the values when you move a mailbox to O365)

 

msExchRecipientDisplayType -1073741818

 

 

msExchRecipientTypeDEtails 128

msExchRemoteRecipientType 4 (migrated mailbox)