Minimize Outlook to the System Tray

To Minimize Outlook XP to the System Tray / Taskbar:

Start / Run / Regedit

Navigate to: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 10.0 \ Outlook \ Preferences

Click on the right side of the screen, right-click and create:

DWord Value: MinToTray
Set value at: 1 (enable) or 0 (to disable MinToTray)