This message could not be sent.

I recently started recieving the following error with Outlook. I can no longer send emails from outlook. They immediately return from the system administrator.

Error Message:

This message could not be sent. Try sending the message again later, or contact your network administrator. Error is [0x80040111-00000000-00000000].

This error only occurs when outlook is set to 'Use Cached Exchange Mode'. If I disable cached mode, I can send emails with no problem.

Where to begin? My question is: "Am I the only one with this problem, or are there others that have seen this too "?

I have done extensive troubleshooting on this end such as removing the entire mail profile, deleting the OST file and creating a new one mail profile. Configured a second computer with Cached Mode and it works successfully. Problem seems to be local to the computer as other computers work fine with the same mailbox access.

Enviornment:

Windows 7 Professional
Domain authenticated
MS Office Outlook Enterprise 2007
MS Exchange Server 2003 Std.