Question SoftwareKeep and SoftwareMedia-dot-com?

[JBHapgood]

Has anyone purchased Windows 10 from either SoftwareKeep or SoftwareMedia-dot-com? They both seem more legitimate than many other outfits, claiming BBB membership and Microsoft Certified Partner status, and have realistic rather than "too good to be true" pricing. But are they actually legitimate?

Also, what's the practical difference between "OEM" and "retail" Windows, given that either can be attached to a Microsoft account?

 

[velocityg4]

OEM is stuck to one motherboard. Retail can be transferred. Although sometimes OEM licenses transfer. Retail also allows limited direct tech support from MS.