If you take all the functionality that you get in Windows...

If you take all the functionality that you get in Windows 2000 and try to re-create that on another platform, you would have to buy several different products, from several different companies, costing more money, and they most likely haven't even been tested to work together in an integrated fashion. With Windows 2000, you get all the functionality of a desktop operating system or a server operating system, along with an integrated Web server, transaction server and message queue server, and it's all in one inexpensive package, designed to work seamlessly together.