Here are some tips for making the switch from First Class to Google Apps. 
Switching from FirstClass
 Life After FirstClass

 Quickly learn to accomplish some of the same tasks in RSU #20 Google Mail that were done in First Class.

Print this guide out and keep it handy as you begin using Mail.

View this guide as a Google Apps Presentation as you begin using Mail.
 Import your data Import your mail, contacts and calendars from First Class.
What's not available in RSU #20 Google Mail  See features in First Class mail that are not in Google Mail.