We've known for quite some time that Microsoft planned to stop providing OEMs with keys for Windows 7 or 8.1 this Halloween and they have made good on that promise.  If you already have a valid license you will contine to be able to use it on your machine and even reinstall from scratch but you won't be able to buy a machine without Windows 10 anymore.  On the corporate side this is being ignored, the new machine may ship with Win10 installed but that will not last long.  This is your last chance to grab one of the few remaining unused Windows 7 or 8.1 keys, The Register managed to spot at least one company still offering a Win7 downgrade so get moving if that is your plan.

"If you can get Dell, HP Inc, Lenovo or any other PC-maker to sell you a PC running Windows 7 Professional or Windows 8.1, please let us know how you did it because Microsoft no longer sells the operating system to OEMs."

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