Gmail labs
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Gmail Labs has been a platform for engineers to experiment and innovate new features to allow better emailing experience.
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With a stretch of features - desired and unwanted - Google buzz has become a phenomenon overnight.
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Now you can undo the mail you have sent to a friend.
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Where none of the email services seem to be upgrading themselves, the Gmail labs is busy experimenting and launching new features for Gmail.
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Gmail has not stopped from experimenting with its features.