Dear Experts,
We are in the middle of testing a migration of an SBS 2011 (running Exchange 2010) over to Server 2012 R2 with Exchange 2013 installed. Trying to install Exchange 2013 on our new 2012 R2 (setup as a replica server in the existing SBS domain) but it always fails with an error:
“One or more servers in the existing organization are running Exchange 2000 Server or Exchange Server 2003. Installation can’t proceed until all Exchange 2000 or Exchange 2003 servers are removed.”
We definitely don’t have any 2000 or 2003 Exchange Servers in our environment. Pre-Requisites Software has been installed. The exisiting SBS 2011 already undergone a swing migration from SBS 2003 – could this be the problem? This migration went flawless and we followed official Microsoft documentation.
Thanks for your advise/help.
Oliver