[__jal]

It isn't 1000 seats, but I know of a Win98/NT4 shop. It is an isolated network supporting mostly phone sales and pick-and-pack, runs some ancient copy of MAS90 and some home-grown software.

These installations exist, and (outside of tech startupland) isn't even that strange, although he is probably pushing things. The owner of that business is proud of how long he's made his IT investment last; his main concern is that dirt-cheap second-hand replacements that can run 98 are apparently getting harder to find.