We just migrated to Office 365 and we now wish to decommission our old 2007 exchange server. I am not going to move request my mailboxes to another server and the mailbox database will not be deleted with all the active accounts within it even though they are unused after being copied to the cloud. All I can think is to disabled all the mailboxes, groups and contacts and then run a powershell script to purge them. Maybe then when I go to uninstall exchange it will pass the checks and uninstall exchange successfully. I am a bit worried about the effects it will have on active directory objects but I test a few accounts and the mailbox purges did not effect the ad accounts so that was good. I see all kinds of documentation online about moving mailboxes and getting rid of old second servers but not alot about getting rid of your only on premise after migration to the cloud. Any advise or recommendations are appreciated. Thanks
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Demote on premise 2007 exchange server after Migration