Exc2k: problem with logon to exchange

Hi!

I have a situation where users without domain admins menbership are not allowed to access their exchk2k mail box any more.

They logon to the domain just fine but when they open Outlook 2000 it asks for their credentials again and doesn’t allow them in.

Any user that is given domain admins menbership can logon without problems. Any ideia?

P.S: Somebody messed up the domain roles on 3 DCs, I mnanaged to take to offline and give allroles to the exck2k server….Cleaned every entry to the others DCs on DNS has well.

Really desperate without ideias here since I’m not an exchange person.