Outlook 2000 hangs on exit
Here is the PATCH for this related KB article -
When you try to quit Microsoft Outlook 2000, you receive the following message and Outlook 2000 does not quit:
Note: This problem may also occur if you try to quit Outlook 2000 after
Microsoft Office Outlook 2003 was used to open your mailbox or if another user
viewed your shared Calendar with Outlook 2003