Hello world,
I'm currently doing an internship in a very big company (>5000 employees) and they recently migrated their exchange servers to exchange 2010. All went pretty well, but estimated is that between 10 and 50 users cannot use outlook anymore. Client computers are windows xp sp3 and have office 2003 installed.
Now the really strange thing happens in this window (random screenshot from google):

When I enter the server address and user account it sometimes recognizes it, sometimes it won't. After pressing the check name button it usually gives errors about not being able to connect to the exchange server. When clicked repeatedly sometimes out of the blue it does get recognised and it gets underlined like in that screenshot. When pressing next I get errors again about not being able to connect to the exchange server. When trying this on other computers that have the same OS, same patches, same antivirus/firewall/security setting, that are on the same subnet, ... you can connect on most computers and you don't have any problems at all. The webmail works on all computers, so I'm guessing it's an office 2003 client setting but I can't seem to find what. The encryption required is not the cause of these problems, I have found info about that on the net already. I really have no clue at all, any of you have any idea at all what might be the cause of this?
Thanks in advance,
zippie666