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Gmail is a mailbox provider by Google. It is the largest email service worldwide, with 1.8 billion users. It is accessible via a web browser (webmail), mobile app, or through third-party email clients via the POP and IMAP protocols. Users can also connect non-Gmail e-mail accounts to their Gmail inbox. The service was launched as Google Mail in a beta version in 2004. It came out of beta in 2009.