Andy Palay gmail engineer most recently announced that “Gmail goes for offline access“. He also said, “Our goal is to provide nearly the same browser-based Gmail experience whether you’re using the data cached on your computer or talking directly to the server.” It’s really an great updates which is looking for millions of users and whenever your network goes down — gmail won’t. It will store all of your data on local drive and on offline you can do all things.
On elaboration Andy says, “Once you turn on this feature, Gmail uses Gears to download a local cache of your mail. As long as you’re connected to the network, that cache is synchronized with Gmail’s servers. When you lose your connection, Gmail automatically switches to offline mode, and uses the data stored on your computer’s hard drive instead of the information sent across the network. You can read messages, star and label them, and do all of the things you’re used to doing while reading your webmail online. Any messages you send while offline will be placed in your outbox and automatically sent the next time Gmail detects a connection. And if you’re on an unreliable or slow connection (like when you’re “borrowing” your neighbor’s wireless), you can choose to use “flaky connection mode,” which is somewhere in between: it uses the local cache as if you were disconnected, but still synchronizes your mail with the server in the background.”
Andy he also informed it’s still on experiment and on US and UK’s gmail user can get this features and soon they will release for the whole world.