As a network admin I've run into many people who were confronted with using the plural for the first time, and it's VERY common for them to hesitate and sheepishly say, "Is it mice? or mouses?" If you ask me, that's where the old school thing comes from. I don't know if you can call me old school or not. My first computer was a 286. I had friends who had others like the Atari ST and Commodore, but DOS was my first real OS.
edit: I just read over this last paragraph and it isn't very cohesive. Sorry.

Frankly, in addition to thinking that mice actually is correct (how can you argue with Logitech?), I think it
should be correct. Why invent a new plural word for it, when a perfectly good (and far less clumsy) plural already exists? For starters, it's confusing. Second, as I mentioned above, it's named after the rodent. Why would the plural cease to be named after the rodent? It's nonsensical. Third, "mice" just sounds a lot better than "mouses". When you say, "mouses," you sound like an imbecile, just like if you saw a bunch of gooses. It just sounds dumb. It sounds jarringly incorrect, even to people with very little grammatical wherewithal like small children.
Everybody knows what the plural to "mouse" is, you know what I mean?