Hi
Have taken over on an old stranded migration from Exchange 2010 to 2013 recently and have now tried to shutdown the old 2010 server. Everything works but Outlook now takes 1 minute before it opens… then everything works.
Started up the old 2010 server again and Outlook clients open within a few seconds. When testing Outlook automatic configuration I can see that it's connecting to the old Exchange 2010 server where it gets redirected to the new 2013 server.
I have looked everywhere (at least that I can think of) and autodiscover all points to the 2013 server so I need someone to point me in the right direction. Users are all on 2013 database.
Best
Thomas