Their also planning an Operating System for the One-Laptop-Per-Child (OLPC) Program.
http://www.reactos.org
http://www.wikihow.com/Get-ReactOS-as-a-Replacement-for-Microsoft-Windows
http://www.laptop.org
Learn more about React OS via FAQ’s
http://www.reactos.org/en/about_userfaq.html
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Windows Home and Business versions interact with each other so smoothly that any user can learn how to use Windows at home from their off-the-shelf PC and find it’s almost exactly the same in the workplace. Yes, the same applies to Unix/MacOS, but these OSes aren’t installed (as workstations) on 80%-95% of business PCs.
Until one distribution figures its way out amongst the many different selections and starts to take a much stronger foothold in a workplace environment, Windows is gonna be around to stay.