Some common reasons why Outlook will not shut down completely when you click
either the X or Exit:
1. PDA synchronization software with your PDA in the cradle. (activesync,
iTunes, etc.)
2. WinFax Pro (especially 10.02 in Outlook 2003) - contact their support
for an alleged fix.
3. Franklin-Covey Plan Plus!
4. COM Add-ins.
5. Mail reminder add-ins that keep a stub of Outlook open in the background
to check for new mail and fire reminders.
6. Anti-virus/firewall programs that are set to scan incoming and outgoing
mail.
7. Skype
8. Infuzer
9. Google calendar synch.
Disable all COM addins and remove the integration with your firewall and AV.
Open Outlook in Safe mode and start/stop Outlook every time after adding
back in your add-ins one by one. The first one you have enabled and the
error message occurs again, you know what to do.