Here are the major features that make Windows 2000 Professional reliable, great for mobile users, easy to use and maintain, and ready for the Internet.

Protects core system files from being overwritten by application installs. In the event a file is overwritten, Windows File Protection will replace that file with the correct version. By safeguarding system files in this manner, Windows 2000 mitigates many common system failures found in earlier versions of Windows.

Provides safeguards to assure you that device drivers have not been tampered with and reducing your risk of installing non-certified drivers.

Minimizes the chance of application failures and unplanned reboots.

Works with the Windows Installer Service, helping users install, configure, track, upgrade, and remove software programs correctly, minimizing the risk of user error and possible loss of productivity. Provides assurance that applications have met a comprehensive set of standards developed by Microsoft in cooperation with customers and third-party developers. Eliminates most scenarios that forced you to reboot in Windows NT 4.0 and Windows 9x. Many software installations also will not require reboots.

AND MUCH MORE !!!