Forum Discussion
tmarshall66
Jan 13, 2020Copper Contributor
Need to add the hybrid EMC to an existing 365/Azure AD Connect environment.
I inherited the following setup that I would like to fix. Customer has migrated ALL MB's to 365 and decommissioned the on-prem exchange servers. Azure AD Connect is running and the optional feature "...
CloudHal
Jan 14, 2020Iron Contributor
tmarshall66 yes that is a right mess, the previous team put you in an unsupported configuration. Since you have AD and AD connect, you do indeed need to reintroduce Exchange. I think you should be OK just installing it in the normal way, you may find that new users created after Exchange was removed do not have all the required attributes (and so do not show up in the EAC as cloud mailboxes you can manage), but most of them should do if they were migrated using hybrid mailbox move requests.
I would stand up a test environment and test the re-introduction of Exchange before doing this in live, you could do this on Azure fairly easily with a test O365 tenant, although quite a bit of work to configure everything of course.