Yesterday when I left work everything was fine.. this morning, every xp machine in the office (4 of them) stoped working with the Outlook 2003 Exchange Server, none of the users can use public calender. Out email trafic is handled through an outside POP3 server, so it is fine. On a related note none of the xp users can get into a local database program we use called Docuware, each time they try they get back an error messageError Conecting: Cannot find active authentication server. All servers are either stoped or the communication channel settings don't allow a connectionOddly, the shared folders on the server are still avaliable to them and work fine. Now all the Vista machines are working fine and are not suffering from this issue at all.1 person needs an answerI do too