We recently upgraded our Exchange 2007 to Exchange 2013. (Separate server)
The Exchange 2007 server is still part of the installation.
I assume all the roles were transferred correctly. Switching off the Exchange 2007 server, Exchange 2013 seems to be functioning as expected.
I am in the process of removing Exchange 2007 from the installation. Is there a single-test or check that I can run to confirm that all functionality is now residing with Exchange 2013? (We can't afford any downtime after the removal)
To add onto what MAS has already recommended in point 6, you can check for this in the SMTP protocol logs.
Client explains it in his blog here.
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