Microsoft Windows 10 Professional

Original Windows 10 Professional

License Type: OEM / Retail

Number of Users: 1, 5, 10, 20, 50

Operating System: Windows

Validity: Lifetime

OEM stands for Original Equipment Manufacturer. The product key is binding to the PC hardware (firmware)

MAK stands for Multiple Activation Keys, where a single product key can activate multiple PC

Original Manufacturer Manufactural (OEM) key is binding to the firmware chip of your PC

Retail key is bindign to the Operating System on the PC