Description:  After using outlook to check my mail, I close Outlook 2003 the process keeps running and the icon remains on the task tray.  If I have the option to "Use Microsoft Office Word 2003 to edit e-mail messages" selected the winword.exe also remains running.  I have had this problem for a few months now and finally got tired of it and was determine to figure out what was going on. 

Problem:  After some checking of COM Add-Ins... and the Add-In Manager... I found the iTunes Outlook Addin was keeping Outlook from completely closing and allowing it to constantly check email after it was closed.

Resolution:  To resolve this issue and stop the rogue Addin from keeping outlook open for it's own use perform the following procedure:

1. If not already, open Outlook.
2. Click on Tools and select Options
3. Select the Other tab and click on the [Advanced Options...] button.
4. Click on the [COMM Add-Ins...] button.
5. De-select the iTunes Outlook Addin and click on the [Ok] button.
6. Click on the [Ok] button to close the Advance Options window.
7. Click on the [Ok] button to close the Options window.
8. Close Outlook, by click on the X in the upper right of the outlook window or select File > Exit.
9. Reboot your computer or just logout and log back in again to ensure outlook.exe is completely closed.
10. Launch outlook and verify it actually closes when you tell it too.

{PC INFO Tip}  If you are familiar with Task Manager, you can use it to ensure the outlook.exe process is closed instead of rebooting or logging off the machine.