Yahoo had been pegged a few weeks ago as the culprit behind excessive data usage on Windows Phone 7 devices, sending far more information in replies to requests from the phone than necessary -- not really a big deal for those on unlimited data plans, but a legitimate cause for concern if you've got a data cap and overage to worry about (as more and more customers on AT&T do these days). Well, turns out Yahoo went ahead and updated its IMAP servers at some point in the last few days, fixing the issue and more or less obliterating the ravenous gobbling of kilobyt
