Offline Gmail is now available as an optional, experimental feature in Gmail Labs. Gmail Labs are unsupported features that may break or behave unexpectedly, so use your discretion before enabling this feature.
Standard, Premier, and Education Editions
US English, UK English (where Gmail Labs is available)
How to access what's new:
End users can enable offline Gmail from the 'Labs' tab in 'Settings'.
Premier Edition administrators must first enable Gmail Labs for their domain for users to see this option. From the administrative control panel, choose 'Email' from the 'Service settings' menu. Check the box next to 'Enable Gmail Labs for my users' and click 'Save changes'. Gmail Labs are unsupported features that may break or behave unexpectedly, so use your discretion before enabling Gmail Labs for your users.
For more information:
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