I've migrated all our useres and services to a new Exchange 2013 system and am ready to uninstall Exchange 2010.
However, to see how the system would work without the 2010 box, I shut it down. All worked fine mostly, but autodiscover took 45seconds rather than being instant. This has an impact on Outlook users with mandatory profiles as they look up their account details each time they logon and use Outlook the first time.
I'm guessing this slowness is because autodiscover is looking for the 2010 box through SCP but failing and it will be fine after 2010 is uninstalled and it's information is removed from AD?