[version_five]

I don't think you've given enough information.

It's reasonable to limit what OS people can use for maintenance and security reasons. There are tons of windows only shops.

If not having it is getting in the way of your work, you should talk to your company about it and discuss how it would help you. (Edit: or if it's you doing the banning, have the same conversation and make sure it's not harming anyone's work)

It reminds me of the old atheism discussions: all companies limit the number of OSs they support, yours just limits one more.