Picture the scenario – you’re at home, and your internet connection’s gone down. You want to ring the providers, but all the info is in your GMail, and you can’t get to it, because you’ve got no internet connection! What do you do? You stop panicking, because you’ve turned on “offline access” for GMail.
It’s a new feature for the popular webmail client that’ll allow users to keep a local cache of their messages so that if your internet connection drops for some reason, then you’ll still have complete access. It’ll also work in situations with no connection at all – on a plane, for example, or a bus.
To activate offline access, go to the Labs section of your GMail. It should be in the list there. If it’s not yet (it’s not for me) then give it a few hours and it should show up. Once activated, click the “Offline 0.1” link in the upper righthand corner to set everything up.
(via Official GMail Blog)