> If a product is still a main part of the portfolio, a company will be
> obliged to provide full support for it..

On what basis do you make that assertion? How do you define "support"?
Microsoft defines what it means by "support" in its EULA. It could, with
perfect legality, sell XP as a "legacy" product with no planned fixes.

At least, that is my understanding.

I was looking at a graphics editor program the other day (can't remember its
name), which was available in two versions: the current one, which would
only run on W2K, XP and Vista, and an earlier version for those with
Win95/98. It was perfectly clear that there was no further support on the
older version, but it was for sale if you wanted it.

Seems absolutely fair and reasonable to me.

SteveT