I've heard in the past one theory for IT departments favoring PCs ... might be that the Macs are very cheap to administer and thus don't require much IT support

I've heard in the past one theory for IT departments favoring PCs ... might be that the Macs are very cheap to administer and thus don't require much IT support. If true, that's a mighty dysfunctional IT department. Perhaps it's the company I work for: if there was a desktop machine that was cheap and required little support, we'd be all over it.