- Professional -- an operating system for business desktop and laptop systems. It is used to run software applications, connect to Internet and intranet sites, and access files, printers, and network resources.
- Server -- both a Web server and an office server. Windows 2000 Server lets users build Web applications and connect to the Internet.
- Advanced Server -- an operating for line-of-business applications and e-commerce. It contains all the functionality of the standard version of Windows 2000 Server, plus additional features for applications that require higher levels of scalability and availability.
- Datacenter Server -- developed to work in high-traffic computer networks, it is designed for enterprises that need reliable high-end drivers and software. It supports up to 64-way SMP and up to 64 GB of physical memory.
Windows 2000 is sometimes abbreviated as W2K.