I have a user on windows 7 with office 2010 and exchange 2010 that has some random disconnects in outlook. If she leaves it open and running it will eventually say "disconnected", sometimes its quick - sometimes it takes a couple hours. I got on the server when she was in "disconnected" mode - I could NOT ping her workstation, get on it via VNC, or RDP. She IS able to get to the internet but its EXTREMELY slow, times out sometimes as the speed is so bad. I had her go to whatismyip and she is getting the right public IP (not the backup) and its a 50x10 connection so should be fast.
No other users (around 40 total) experience slow internet or anything else. It has recently been brought up that there are a few other users (win7 with office 2010) that went disconnected - no XP users have had any issues, both on office 03, 07, and 10.
The resolution is usually just close outlook and re-open and its fine (and then I can ping/vnc/rdp). Sometimes that doesnt work and a reboot is needed.
I DID just upgrade from exchange 03 to exchange 2010, HOWEVER - this user has been having this issue before that even happened.
Checked event viewer on the DNS/AD server and everything was fine.
I left domain, renamed pc and re-joined domain - also did a repair in outlook...Still no luck.