A cloud based email & collaboration suite please find features of Google Apps for Business
Branded Email: with Google-powered search, 30GB of storage + offline support + configurable with Desktop mail clients + email delegation functionality
Sharable Calendar: with Tasks + Events + SMS reminders Google Drive: to store your files in the cloud, share them, and have access to them from anywhere.
Google Docs: Create, share and work on documents with your whole team in real-time. Over 30 Formats supported for viewing online.
Video Chat: 1 to 1 + 1 to Many in Google Hangout