Here is a windows registry file to set SquirrelMail as a windows email program Once this entry is installed, go to Internet Options and select the Programs tab. SquirrelMail should be an option under E-mail: ---- Cut here ---- Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail] @="SquirrelMail" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\Protocols] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\Protocols\mailto] "URL Protocol"="" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\Protocols\mailto\shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\Protocols\mailto\shell\open] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\Protocols\mailto\shell\open\command] @="rundll32.exe url.dll,FileProtocolHandler http://mail.server/squirrelmail/src/mailto.php?emailaddress=%1" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\shell\open] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\SquirrelMail\shell\open\command]