If you're resolutely clinging to Windows 7 because you can't think of a single reason to upgrade to anything newer, please allow me to introduce you to the killer feature you're missing:

Hyper-V.

Microsoft has spent years polishing its virtualization platform on the server side. Beginning with Windows 8, the benefits of all that work finally began migrating to the desktop, in the form of a feature called Client Hyper-V.

On the desktop PC I'm using to write this article, for example, I can summon a virtual PC running Windows 7, Windows 8.1, or the Windows 10 Technical Preview. For those times when I'm feeling nostalgic, I can even boot up a Windo ...

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