Google has finally made it possible to use offline versions of their three most popular applications, namely, Gmail, Google Calendar, and Google Docs. Offline Gmail was announced back at Google I/O conference in May, and it was revealed that internally Google was using offline Gmail (and Calendar and Docs) for months before the May announcement. Starting today , offline Gmail will be available to all users. Offline access for Google Calendar and Google Docs will be rolled out from next week.