After applying KB973917, KB971737, KB976325, KB974318, and KB970430 to my SBS 2008 server all of my Outlook 2007 machines are constantly prompted for their domain credentials.I have reviewed KB321652 but this has not corrected the issue.

Hi Tzukius,I would start with outlook team first to check if other users / customers are experiencing the problem, there is a dedicated forum to answer outlook related queries , please use the below link.http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/threads