After applying some updates to the server (SBS2003) and rebooting I am gettings a lot of Event ID 3005 Errors in the Application Event Log. It is an ActiveSync Error and the result is that users cannot send or receive email. This seems to be an intermittent problem where they can connect sometimes to send/receive, but not others. It is causing major problems. Anybody had this problem before? I have tried to go through the IIS settings (as suggested in one of the answers I googled) but no luck.