We have a SBS 2008 Server and clients using Outlook Office 2007. We have installed Exchange 2007 SP3 successfully. The Server OS has the latest fixes. After we installed Exchange 2007 SP3 Outlook keeps asking for login. I have tried the different solutions suggested in the Experts Exchange forum. Changed IIS Authentication and SSL settings (Enable kernel-mode authentication accept client certficates but with no success. The Out of Office function also stopped working (Server not found) Anyone experienced the same?