Google Apps Review
Ranked in these QuestionsQuestion Ranking
Pro Uses Gmail for the mail client
Gmail is arguably the best mail client available, especially for a web app.
Pro Great integration into the whole suite of Google tools
Google Drive, Google Contacts, Google Docs etc etc. Using Google apps makes a lot of sense when you're already using a bunch of other Google tools. The organisation features (such as groups and permissions) turns the typically consumer focused products like Google Docs into fantastic enterprise tools.