Hi, I have a SBS server 2003 running Microsoft Exchange which gets the mail from an ISP (using POP3 connector). I use Outlook 2003 to get the mail on my laptop from the server (domain) and I was wondering how I configure the server or laptop to send and receive emails when I am at home. Note - I have a different ISP at home. Any Suggestions ?????

If your ISP at home is also a PoP3 I would set it up on the exchange server and deliver to your outlook mailbox.
Then create a VPN to the server then open and use outlook as if you were on the domain.