Article updated: 2/19/2013 4:15 PM

Microsoft’s Outlook takes aim at Google’s Gmail

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Outlook.com, accessed mainly via Web browsers, shares the brand name with Microsoft's e-mail, contacts and calendar program, part of the Office suite of software installed on personal computers running Windows. The software has been in preview since July 31, and its final version was released Tuesday.

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Microsoft is so confident it has the Internet's best email service that it is about to spend at least $30 million to send its message across the U.S.The barrage began Tuesday when Microsoft's twist on email, Outlook.com, escalated an assault on rival services from Google Inc., Yahoo Inc., AOL Inc. and a long list of Internet service providers.