My office = my employer's office. I didn't think I'd need to be quite so verbose on that one. Similarly, my employer's users/staff who should be doing work on my employer's computers. They need no freedoms over and above what is required to do their jobs. On the other hand, it's the real world and they're given plenty of leeway to do stuff (particularly web browsing) on their downtime.
My beef is when someone calls me and says "X doesn't work on my computer", and I find out that they're using Chrome. And that "X" works just great in Internet Explorer, because I know that a number of the companies that we deal with have ActiveX controls on their "extranets" (or whatever the word is these days), and these only work in Internet Explorer. And I'm wasting my time, at my employer's expense, chasing people for installing Chrome on "their" machines.
They seem to think it's their god-given right to install what they want on "their" computers, and don't for one moment stop to consider the security and administrative nightmare that would cause; Google Chrome not only panders to their delusion, but reinforces it, especially with the attitude that "it's from Google, so it's fine". The office computers are tools to do jobs, not toys. They're the company's, not the user's. Personal internet access at work is a privilege, not a right. Many people seem to forget that.
Presumably you would like all of "your" users in "your" office to run whatever they damn well please? Where does that end then? When someone calls because they're having trouble with Outlook under WINE running on UbuntuCE? Good luck with that, by the way...