What is Google Apps for Education? 

http://www.google.com/apps/intl/en/edu/ 

Google Apps for Education is a free, secure, anytime, anywhere suite of hosted email and collaboration applications exclusively for schools and universities. Google's web-based messaging and collaboration apps are a tremendous time saver, secure, and safe storage of your data.  Apps include emailing, calendaring, tasks, sites, online document creation and storage, communication tools and access to these apps through supported mobile devices.