Unverified50% confidenceFactExact time
Microsoft originally planned to release a system codenamed Neptune, built on the NT kernel and scheduled for March 2000, but it was cancelled because it could not be delivered on time.
1
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50%
Confidence
Long-term
Relevance
10/4/2026
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Related Claims
UnverifiedMicrosoft's original codename for the next-generation consumer Windows was Neptune, built on the NT kernel.69% similarUnverifiedThe Neptune project was ultimately cancelled, and its team was merged into the development team for the successor to Windows 2000, codenamed Odyssey.64% similarUnverifiedMicrosoft had been using the NT kernel in the enterprise market since Windows NT 3.1 (1993); Windows 2000 was the first NT-based product targeting enterprise desktops, and Windows XP was the first to bring the NT kernel to ordinary home users.55% similar
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