My tax dollars go to set up government agencies as Microsoft-only shops. Concerns about the vulnerability and lack of flexibility of a monoculture aside, it leads to situations like this one:

Employer: We're hiring you because you have a lot of Linux experience, and we'd like to get some diverse ideas in the group for this project.

Employee: Cool. I can do that. Can I work from home?

Employer: Sure.

Employee: Uh, my password isn't working. Can you reset it again?

Employer: Ooh, right. Our extranet is IE-only. But that's okay, you have a Windows computer around somewhere, right? Everyone else does!

Employee: That's because you bought them those computers.

Can you see where this is headed? Grr. So much for standards and openness. Glasnost and perestroika.