If you are encountering an intermittant error in Outlook 2002, Outlook 2003, Outlook 2007, or Outlook 2010 with Windows XP, with Windows Vista, or with Windows 7 when sending and/or receiving email, with the error codes 0x80040600, here is a recap of the error message and a list of most likely symptoms.
These is the typical message received: Task 'yourname.com - Receiving' reported error (0x80040600): 'Unknown Error: 0x80040600'
This is most likely due to a corrupted Outlook .PST file.
For more information on this error, and the recommended solutions, please visit Microsoft's official support article on these error messages at the following:
http://support.microsoft.com/kb/814441
http://support.microsoft.com/kb/287497