Earlier quoted context omitted.
As a student who is in that dataset, I think it makes sense. Basically, UVa is a pretty preppy school and Macs are really trendy right now. From my friends and what I see on grounds, I'm surprised that the Mac ownership is not numerically higher. We also focus on the liberal arts, which helps Mac. Linux is a real pain to get to work on the network. The decline in "other" is probably in a large part the result of Mac…
I think you're remiss in not mentioning that UVA has very strong science and engineering programs. (This is a bit surreal, as I did my undergrad at Virginia Tech, my Master's at W&M, and now my PhD back at Tech. I've never cared for the rivalries, but I didn't think I'd ever feel compelled to defend UVA to one of its own students.)
:)