Just remember - after you install the first 2010 server, it's no longer supported to install any more 2003 servers.
But yes, they co-exist just fine. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Buff Sent: Monday, January 20, 2014 1:50 PM To: [email protected] Subject: [Exchange] Exchange 2010 SP3 and Exchange 2003 Do they coexist OK? I'm performing a migration this week for our HQ, and want to make sure that go as far as I can with patching on the new config before I move anyone. Also, it's only for HQ, and the two overseas offices will remain on 2003 for a while. I'm standing up a CAS server and a combined DB/Hub server - CAS first. Kurt
