Ben Worthen of The Wall Street Journal:
And this is why information-technology departments always worry about employees’ bringing new technologies like the iPhone into the workplace. The conventional wisdom in IT shops is that anything that’s not standard-issue will cause unanticipated problems when it’s introduced into an existing network. The new technology may be perfectly innocent; but the network still goes down, and the IT guys have to fix it.
Translation: A lot of IT infrastructure is fragile rickety crap, and the people responsible for it aren’t smart enough to fix it so they make rules and place blame based on little more than superstition.
(lest there be any confusion, all the above is a blockquote from Daring Fireball)