1. Click Settings and click the Labs tab.
2. Select Enable next to Offline Gmail.
3. Click Save Changes.
4. After your browser reloads, you’ll see a new “Offline0.1″ link in the upper righthand corner of your account, next to your username. Click this link to start the offline set up process and download Gears if you don’t already have it.
When you hit save, Gmail will synchronize new messages you didn’t have downloaded before and remove the ones you’re not planning to read from your hard drive. You can always change your settings back to keep fewer or moremessages later on — fewer messages means Offline Gmail runs faster.
