Hybrid Office 365

[ITGURU]

I'm having an issue with hybrid mailboxes with Exchange 2016 and office 365.

I've got the situation whereby mailboxes are created on office 365 before Ad/local exchange knows of the user and GUID.

I successfully managed to copy the 365 mailbox to the local user account and this created a mailbox type of 'office 365' in exchange control panel.

Mail was successfully being delivered as 2 copies both to local exchange mailbox and Office 365.

I then did a mailbox migration from 365 to local.

Once this had finished, 365 became inaccessible- no local mailbox, local outlook prompted changed were made requiring a restart of outlook, it wouldnt open. tried to create a new account, added succesfully but on opening, wouldnt open the folders.

there is a mailbox as i can see the usage from admin centre.

 

However, the only difference is that the user in in a different forest to the exchange forest.

 

How does hybrid work in this scenario if the exchange organisation is in a different AD forest to the user domain forest..

[chaplic]

I think you need to wind back about 4 steps. If you have managed to create an on-prem mailbox and a cloud mailbox, then that's a bad thing (creating a cloud mailbox when a real on premise mailbox exists is quite common, I've never seen the other way round). Any steps after that are invalid. I would be looking to export mail to PST, removing all exchange attributes, removing exchange license and starting from fresh.

 

Hybrid will work perfectly well in the scenario described. You have to ensure the right attributes are being synced from the right domain. So at the very least exchange attributes (msEXCH and so on) are synced from the Exchange environment). If these are being synced from the user AD, then it's not a surprise things are going wonky.