I started looking after exchange 2003 environment just recently and not too confident as I am trying to understand environment yet..
basically, all the users have 2007 or 2010 outlook and server is clustered with two nodes.
Main server (back end) run out disk space on C drive and since then users are not connected to server. there are now 12Gb free space available and when user tries to connect they receive server unavailable error. auto discovery pickups wrong store details in client's outlook settings when I try to reconfigure their outlook settings. I though it may be DNS related but why would it be since it was fine till other day? default server does not have any mailboxes when I checked them from ESM. So, I was advised to move mailboxes from that default store to intended store but can't see anything in there!
Users are authenticated via GC server at remote sites and this domain has few DCs and few GCs. Any advise would be very appreciated.