Offline Google Mail for Chrome The first update is the addition of a settings page (look for the new settings icon). You can now choose whether you want to synchronize 7, 14 or 31 days worth of mail. So the next time you get on an airplane, you can sit back and tackle up to 31 days of mail all while offline.
They also made a number of other updates to Gmail offline:
Improved attachments: All attachments are now downloaded and available for offline use
Keyboard shortcuts support: If you have keyboard shortcuts enabled in Gmail, your setting will transfer over to the Gmail offline app. If you're not sure what you can do with keyboard shortcuts, try pressing ‘?’ next time you’re using Gmail or Gmail offline.
Numerous performance enhancements: Messages and attachments now download at a faster rate and some bugs have been fixed.
