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Exchange 2010 Full Hybrid Office 365 removal

    Question

  • We have an exchange 2010 server that we just did a Full Hybrid migration with Office 365.  We are using Azure AD Connect to synchronize our AD users to Office 365.  Our goal is to move all mailboxes to Office 365, remove Exchange 2010 and reuse the server for installing the Exchange Hybrid 2016 server.  However after reading numerous threads on this topic, I'm looking for something a little clearer on the process.

    The situation I face is that I need to re utilize the current server that Exchange 2010 is on.

    I have already migrated some mailboxes over to Office 365, so I'm wanting to get a good idea of the flow for when all mailboxes are moved.  I have the commands ready for breaking the Full Hybrid to where we are only using Azure AD Connect to sync users and all DNS will be pointed to Office 365.  The part that I'm not clear on is, what will happen when I fully remove Exchange 2010 from the Active Directory environment and then try to install the Exchange Hybrid 2016 server?

    Can I fully decommission the Exchange 2010 server, remove it from the network then bring up a new server with Exchange Hybrid 2016 server?  I read that I need to have the mailbox server role enabled in order to manage the Office 365 mailboxes from the Exchange Management Console.  Are there any other roles that need to be installed/enabled as well?

    Tuesday, May 15, 2018 11:55 PM

All replies

  • Exchange 2016 only has 1 role - the mailbox role.

    There is no in-place upgrade option for Exchange Server, so one option would be this:

    P2V that server, restore it elsewhere, reformat and install Exchange 2016 on the old hardware. Then uninstall the Exchange 2010 server from the VM and then destroy the VM. 

    Thats an annoying amount of steps, but its not "supported" to uninstall your only Exchange server with a production hybrid deployment. Having said that, it'd probably work fine. If for some reason the uninstaller doesn't let you remove the server with remote-mailboxes present, you can remove the whole exchange organization from the configuration partition in ADSIEdit and reinstall Exchange 2016 with the same org name. That part is REALLY unsupported, but the only reason we're told to keep an exchange server around is for the purpose of recipient management. 

    This assumes you've moved 100% of your non-recipient-management dependencies to Office 365. 

    Disclaimer - what I said is unsupported by Microsoft and you may break everything and have no way to get help. There I said it.


    Mike Crowley | MVP
    My Blog -- Baseline Technologies

    Thursday, June 14, 2018 10:37 PM