I stumbled on the Wikipedia page for Windows 2.x the other day and briefly scrolled through it. One thing that caught my eye was that it apparently was supported until December 2001.
While I know that Windows releases tend to get supported for 10+ years these days, I was a little surprised to see this for an ancient and less popular version like 2.x. Seeing how the 1.0 page also notes the same date, I'm guessing there was a general sweep date published at some point, but it raised the question in my mind of did Microsoft actively support these old releases up until 2001? If they did, is there any evidence of patches, documentation, or anything that would say that this was more than lip service?