[updated] - Windows 2000 License Key
Microsoft ended mainstream support for Windows 2000 in 2005 and extended support ended in 2010.
There were two primary methods of licensing used during the OS's lifespan: windows 2000 license key
Windows 2000 represents a "Golden Era" of Windows computing—stable, powerful, and requiring no online activation to use. For the enthusiast, obtaining a valid license key usually means hunting for original retail media on eBay or IT surplus sites. Microsoft ended mainstream support for Windows 2000 in