"Every morning, millions of people wake up to a very refreshing experience at work. They don't see "mailbox is full" errors in their email. They don't worry about backing up their data. They can get to any file they need from any computer, anywhere with Internet access and a browser. They can all access and edit the same documents and spreadsheets at the same time as their colleagues. They use Gmail and Google Calendar at work as fluidly and easily as they use their personal Gmail accounts. They video, voice and text chat with their peers globally as naturally as they send email.
Official Google Blog: "Going Google" with Google Apps
The IT people at these companies and organizations don't waste time or money buying, installing or managing email servers. They focus on the smart, innovative stuff they want to work on, because they never have to bother with expensive and painful software upgrades, hardware compatibility issues or managing data centers. They have left many IT frustrations and costs behind and moved on to something better."
Official Google Blog: "Going Google" with Google Apps