I get the following error, displayed in the Outlook
message list/body section:
"Unable to display folder. Another application closed
unexpectedly while using your Personal Folders file '<My
PST File listed here>'. To prevent potential damage to
your Personal Folders file, it will not be available until
you close all applications currently using it."

I've not noticed any specific pattern to this; however, I
encounter it frequently. Any idea what is causing it?