are there known issues w/ Outlook 2011 for mac and Exchange server 2007 not accepting user passwords ?

Once again Outlook for Mac 2011 won't connect to my Exchange server.

Won't accept user passwords or user name according to the popup window.

Have also tried connecting to server when directly connected to the same network via ethernet as the server with same results.

All my other Exchange enabled devices work fine- Ipod, Ipad, Droid phone and Windows Outlook 2007 with same user and passwords.

Have also tried dumping the accounts, folders, etc per previous directions, it worked once but not now.

Psw

Question about Outlook Express