Pete Conway, director of large enterprise servers in Microsoft's Windows Business Division, said the pace of Windows 2000 sales has "pleasantly surprised" the company since it was released on 17 February last year.
The predecessor to Windows 2000, Windows NT 4.0, did not reach the 1 million licences mark until 17 months after it was released, Conway said.
"We're incredibly excited," Conway said. "This is the fastest rate of adoption we have ever had for a server operating system platform. We should easily eclipse the 1 million server licences mark by the anniversary date."
Microsoft pointed to an internal survey it conducted of Windows 2000 users and are seeing total cost of ownership savings of 5 per cent to 30 per cent. The study, which Microsoft said was audited by a Giga Information Group consultant, found that larger companies are expecting, on average, a net bottom-line benefit of $US8 million over three years, Microsoft claimed.