Planning on upgrading from on-premise Exchange 2007 to on-premise Exchange 2013 through a coexistence scenario. After installing the pre-reqs as well as the windows updates, I'm still failing one readiness check: "Setup will prepare the organization for Exchange 2013 by using 'Setup /PrepareAD'. No Exchange 2010 server roles have been detected in this topology. After this operation, you will not be able to install any Exchange 2010 servers. For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.NoE14ServerWarning.aspx" This new server is on the same domain as the old Exchange server. The 2007 exchange server is on sp3 and rollup 10 required so I'm not sure how it isn't being detected. To me that warning is stating that if I go forward at this point, the servers will never be able to coexist. So if 2007 is being detected, it just isn't notifying me here? Yeah I'm on sp3 and rollup 10, but I guess I was just hoping for some kind of readiness check detecting that yes, you're good to go. Would something like that check just come later? Just wanting to make absolutely 100% sure I don't screw up our coexistence migration.

Hi The warning refers to Exchange 2010 servers, as you don't currently have any you will not be able to add any after you PrepareAD for 2013. If you want to have the option of using 2010 in future then you would need to PrepareAD from the 2010 SP3 media and install a server running all the roles first. Going on the assumption that you only want to use Exchange 2013 and 2007 in future you can ignore this warning. Cheers, Steve