When I close Outlook, it fails to completly end processing unless.

[jp]

I use the task manager to do so. If I leave the program alone for a period
of time, it does finally close, but before that it is not possible to
re-lauch Outlook without either rebooting or ending the program via task
manager.

 

[Brian Tillman]

I use the task manager to do so. If I leave the program alone for a
period of time, it does finally close, but before that it is not
possible to re-lauch Outlook without either rebooting or ending the
program via task manager.

See if something here helps:
http://www.howto-outlook.com/Faq/outlookdoesntclose.htm