If you are using Microsoft Small Business Server then Google Apps for your domain is a great additional solution for offsite archiving of all mail as well as spam control and mail queuing while your server is offline.

However the built in POP3 connector in SBS is very basic and doesnt support alternative ports or SSL which Google force you to use.

To get around this you need to grab hold of Stunnel and OpenSSL

These are the folders that should be excluded from Virus Scanning on an SBS 2003 installation. See the Microsoft articles 823166 and 822158 for more information.