Wait do you mean your experience working for companies that mandate Windows, or your experience listening to anecdotes from people who've worked at said companies?

Both. But I don't give much credence to internet anecdotes -- they are untrustworthy. Close-friend anecdotes who give lots of details are a big part of my impression.

It might be one of those false-positive effects.

e.g.

Few windows shops are Initech, but all Initechs run Windows, therefore to avoid Initech you could avoid Windows.

There are probably other heuristics with fewer false positives, but anyway I'm just saying.

Are we talking about companies that mandate Windows, or companies that just lean strongly toward Windows?

Much as I dislike it, I use it as work because some of our key software is tied to it. (I VNC to a Linux box to do actual development.)