Very simple network: single server with one VM that is a DC, one that is Exchange 2010 and one that is Exchange 2013. Just moved from SBS 2003 to Exchange 2010 last month, and then only as the required step on the way to 2013.
I have now implemented Exchange 2013. All mailboxes have been migrated to the DB on 2013, Outlook connected to the 2013 server, and inbound SMTP is directed to the 2013 server. This was a very straightforward 2013 installation with pretty much all default settings and with no plan to have the two servers co-exist longer than necessary. But I am sure there was a lot more going on behind the scenes regarding failover and server-to-server communications, and I suspect that I could leave a lot of stuff orphaned if I just uninstall Exchange 2010, then shut down the VM and remove that server from the domain.
Does anyone have a good step-by-step process for now removing Exchange 2010 without breaking anything or leaving obsolete objects in AD? Is it just as simple as uninstalling Exchange 2010 from that server, or are there specific steps to tell AD (and/or the Exchange 2013 server) that some Exchange-related roles have now moved to the 2013 server, etc?