Here's a sight to make Mac-lovers cringe: a Windows "Start" button on the Mac desktop.

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Right there in the dock is a sight that in another era would have given Apple Computer's (nasdaq: AAPL - news - people ) fiercest defenders fits of panic: a Windows "Start" button available on a Mac.

FORBES: Dual-Personality Macs

RetroUI Pro allows you to brings back features which Microsoft removed in Windows 8, such as the Start Button and Start Menu, and adds RetroUI exclusive features that allow you to run the new Windows 8 Start Screen and new Windows 8 Apps on the classic Windows desktop.

FORBES: Make Windows 8 Look Like Windows 7