Hi,
I've have had 2 connected 2012 sites running for about a month with Exchange 2013 running ok. Now I've applied the latest (as updated) Cumulative Update-2 to Site 1.
Attempted same update at site 2 but an error like 'Schema changes have been detected so update cannot be applied' is stopping the update being applied.
Ok, so lets check the AD replication - broken - nice. Site-1 isn't talking to site-2 now. Re-boots etc and waiting a few hours - still no replication so no ability to update site 2.
I must admit 2012 with Exchange 2013 appears to be a bit of a hopeless product - error after error on a vanilla setup with hardly any users.
Any ideas on how to get passed this - Im not sure this Cumulative Update can even be removed - as MS state removal removes all of Exchange - nice again.