The four-color Windows logo has been around since 1985, though the current flat version dates to 2012. The colors don't map perfectly to specific products, but they've been consistent long enough that most people associate the combination with Microsoft before reading the name.
The four Windows logo colors were redesigned in 2012 as part of the Metro design overhaul. Microsoft moved away from the rainbow flag-waving logo of the 2000s and toward a cleaner, flat set of four distinct colors. Red (#F25022) covers Office and enterprise tools. Green (#7FBA00) associates with Xbox and productivity success states. Blue (#00A4EF) anchors Windows and Azure. Yellow (#FFB900) covers Bing and business intelligence. Used together, they signal that Microsoft spans every corner of the software world.
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