Officials at the Redmond, Washington company said yesterday that the 1 million figure includes Windows 2000 Professional, Windows 2000 Server, and Windows 2000 Advanced Server sold through channel resellers, retail outlets, and PC manufacturers.
The total does not include large corporations that have purchased licences through enterprise agreements, which if factored in would push sales over the 1 million mark.
"Reaching 1 million units so quickly is testimony to the high quality and reliability of Windows 2000," Microsoft president and CEO Steve Ballmer said in a statement. "This is a product that was built from the ground up with the help and support of customers and industry partners. It's great to see them thoroughly evaluating the platform in their environments and deploying it throughout their organisations today."
A company spokesman also claimed that the volume of calls to the Microsoft Customer Support centre has been lower than for any other operating system released by Microsoft on a per-unit-sold basis.