When Gmail first launched on April 1 in 2004, there was internet speculation that is was a hoax, but it was real.
Google introduced a completely new way to email with Google search built-in.
Gmail has since taken over as the most popular inbox in America, with 1.5 billion users.
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To celebrate the milestone, Gmail is rolling out new features today, including scheduled send, suggested subject line and "smart compose," which gives you contextual suggestions as you type.
There is also a new dynamic email feature that lets users open links without having to open a new tab.