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
Install both programs and copy the dll’s from “program files\gnuwin32\bin” to windows\system32
Then edit stunnel.conf to include the following
client=yes
service=gmail
[gmail]
accept=127.0.0.1:110
connect=pop.gmail.com:995
Now in your pop connector settings use 127.0.0.1 as the Email server for your Google Apps accounts