If you would prefer for Outlook 2002 to drop down into the system tray instead of the taskbar, give this tweak a try!
Also not that when Outlook is minimized to the tray you will not be able to use ALT+TAB to return to it.
Key:HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 10.0 \ Outlook \ Preferences
Value Name: MinToTray
Data Type: REG_DWORD
Data:1 (0 to disable MinToTray)
