Offline Gmail is now a regular feature of Gmail and is no longer enabled as part of Gmail Labs.

Editions included:
Standard, Premier, Education and Partner Editions

Languages included:
All languages supported by Gmail

How to access what's new:
Click the "Settings" link in the top-right corner of your inbox. Click the "Offline" tab and then select "Enable Offline Mail for this computer." Click "Save Changes" and follow the directions from there.

Note: The option to make Offline Gmail available for the domain is controlled by the domain administrator.
Premier and Education editions only: In the control panel, go to 'Email Settings' and enable/disable the checkbox for 'Enable Offline Gmail for my users'.

For more information:
http://gmailblog.blogspot.com/2009/12/offline-gmail-graduates-from-labs.html

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