Windows is the predominant OS at UTS. Generally, Mac OS is available to students readily, but there are definitely fewer Macs than Windows systems. IT/Eng students can also use Linux (Fedora) in building 10.
well if ur thinking of buying a laptop, it really doesn't matter - the wireless networks at UTS supports all OSes and we even have a dedicated wireless network for your smartphone (and/or iPod touch).
+ the good thing about the mac labs (there are quite a few) are that you will always be able to find a computer to use.