Getting this problem on one new PC, Windows 7 Professional running MS Office Outlook 2007 connected to Exchange Server 2003.
Randomly receive the above error when sending or replying to email.
The workaround is to close down Outlook completely and re-launch it and then I can send or reply to email with no errors. It happens about once every couple of days. Can't reproduce it to order - it just appears when it wants to. No attachments in the emails I'm sending, nothing unusual, the destination address is always valid.
No errors in the Event log and no problems found when I run the Office diags.
Just getting very annoying.