When releasing Windows 8, many people thought that Microsoft would use the blue logo as company's logo. But we are "cheated", Microsoft unveils a new logo. Watch video below.
Since unveiling its first logo in 1977, Microsoft has changed its logo a few times, they are
In 1977, its "Micro-Soft"
Microsoft "blibbet" logo, filed August 26, 1982 at the USPTO and used until 1987.
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Microsoft "Pac-Man" logo, designed by Scott Baker and used from 1987 to 2012 with the 1994–2002 slogan"Where do you want to go today?".
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Microsoft logo as of 2006–2011, with the slogan"Your potential. Our passion.
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Logo by Microsoft with the slogan"Be What's Next."2011–2012.

Introduced on August 23, 2012 to symbolize the "world of digital motion" and Microsoft's "diverse portfolio of products." 2012-present
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Now lets look back to Windows's logo hisory. From 1985's pure color logo to current Windows 8 logo. It goes through 7 changes.

Reference : http://www.36kr.com/p/147595.html