"...Customers told Microsoft they love blue; it's predominantly their favorite color. That's why the Office 2007 UI defaulted to a blue color scheme. In practice, however, having all that blue onscreen distorted users' color perception. Placed images would appear too reddish, and users would complain that Office was shifting the colors somehow. As a result, Office 2010 now defaults to the more neutral Silver color theme, and users should be happier (even if they don't realize why)."
Office 2010: At last, the suite that users built | Developer World - InfoWorld
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