Can you be a little bit more specific?
Are you looking for something specific?
You will find a good list here
http://www.jasonslater.co.uk/index.php/2007/09/10/exchange-2000-and-exchange-2003-port-usage/
But keep in mind that outlook uses RPC to connect to the Exchange server, that means all ports above 1024 can be used
Deli