"A message could not be delivered. Make sure ther is sufficient memory and disk space and the the message store is accessible and then try again"
You can also get this article by sending an E-mail with a subject
of
"Q163860" (without the quotes) to mshelp@microsoft.com.
This problem is fixed in the "Internet Mail Enhancement Patch". You
can find it here:
http://officeupdate.microsoft.com/downloadDetails/outlimep.htm
The link above has the outlimep.exe patch.