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As of now Microsoft has announced that they will not release any new version of Windows after Windows 10. Only it will be upgraded. But who knows...
You really should go to the Office 365 help forum. There you can find much better help on all of the 365 programs. Mainly because this is a brand...
Microsoft's plan is to only maintain windows 10,rather than a myriad of branded releases, especially for different devices(tablets,consoles,etc)....
linux distribution properly supports the retina display yet, and running them inside virtual machines is not so pleasant. But if X11 adds this...