First question here :) And an odd one!
Hope one of you guys saw this issue before.
I have an exchange (2013) DAG, with 3 servers (2012 R2). As far as I can tell, everything is setup fine (well, it has been for a few years now!) but very recently (about a month), when one of the server goes down (let's say a reboot, or even an IIS restart!) all the Outlook clients disconnect! Even if the server does not have live mailboxes.
This only happens for one server. When I reboot any of the other 2, the failover happens as usual if the client database is hosted on that particular server.
So, that one is a first for me, and as far as I can tell, everything is setup as it should be, and config does match the other 2 servers.