I've heard in the past one theory for IT departments favoring PCs (besides all of the pro-PC marketing aimed at them) might be that the Macs are very cheap to administer and thus don't require much IT support. I thought this was an interesting response to this news, over at the AppleInsider forums: "I work for one of the largest corporations in the world. Surprisingly, they don't do anything to block access to networ…
* Buy an external HD, set up Time Machine.
* Keep an identical spare Mac.
* If you're paranoid, buy a second external HD; rotate it and the first drive for TM backup every week-ish (keep the inactive one next to your spare Mac)
* When the Mac dies; toss it, get out the spare, plug in the TM drive and restore. Totally back in business in an hour or three. Buy another spare.