I am running a fully updated Exchange 2003 server and OWA prompts for a password when attaching a file when connecting from Safari on a Mac. If using IE, it works just fine. I have reset the Virtual Directories as described in: http://support.microsoft.com/kb/883380/en-us
. I receive a "Timer_ConnectionIdle" error in the IIS log files on the server when trying to attach the file. We have not noticed any other issues. Outlook (setup as rpc/http), Entourage, Windows Mobile Active Sync and OWA from IE are all working without any noticable issues.