Useful Gmail Tips, Tricks, and Tools
Read Gmail Offline Using Chrome Browser
For people that are on the go, you can read your Gmail account when you are not connected to the web. You can also search, read, and compose e-mails when you’re not connected to the web. Gmail will simply auto-update when you reconnect to the web.
To set up offline Gmail, go to the Settings menu and hit the Offline tab. You may notice that you will have to install a Google browser app if you use the Google Chrome browser.