YES they are. I work in IT fixing junk MS products and let me just tell you the arrogance starts from the top.
In a recent interview with Bill G in Newsweek or Business Week, the interviewer brought up Mac OS X and how it's security is superior to Windows (it was a very good point and presented in a nonthreatening way). He went on about how people hack and take over OS X every day and dared people to do that once a year with Windows. Sorry, Bill - the reality is that Windows gets hacked every SECOND.
MS is very very arrogant in all their business dealings as well. Instead of partnering, they pretty much tell you how it's going to be. Why? They realize they are the only game in town for many.
That's why I always recommend people buy Macs and use OSS (Linux) in the server room.
It's why I own a Mac and a Wii and would never buy a 360 - I'd buy a PS3 if I wanted a HD rig. You have to teach MS they are nothing special (they are not).