Google’s web-based messaging and collaboration apps require no hardware or software and need minimal administration, creating tremendous time and cost savings for businesses. using Google Apps, you could set up a bunch of users who get Gmail, GCal, a personalized start page, and chat all with usernames like admin@yoruwebsite.org, dude@yoruwebsite.org. Your users would log in to a Google hosted control panel (which you can customize with a yoruwebsite.org logo), and all their email would get sent with their custom domain email as the From: address.