This registry hack will cause Outlook to go to the system tray when minimized. The registry changes to all the recent versions of Outlook (including XP, 2000, and 2003) are described in this tech-recipe.
Open up notepad, and copy the appropriate text for your version of Office. Save the text file, and rename it to “XP_OutlookToTray.reg”. Then merge it into the registry by double-clicking it. To undo this, simply change the value to zero.
For Office 2003:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Preferences]
"MinToTray"=dword:00000001
For Outlook XP:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Preferences]
"MinToTray"=dword:00000001
For Outlook 2000:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Preferences]
"MinToTray"=dword:00000001)
