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Something relatively modern. Wasn't Win2k a failed product?

My point is, I don't know of anything modern that is spelled sufficiently similar to "Windows 2000" for the latter to be a plausible typo of it.

Windows 2000 was quite successful, and was the most reliable Windows version so far.

You might have a point there. But honestly, it's so ancient that I had to do a double-take when I saw a UI inspired by Windows 2000.

Windows Me?

I think so, Me was a failure. 2000 not so much.