In early February, the culprit of many user’s ongoing data woes was identified: Yahoo! was to blame (though they deny that it’s their fault). Unfortunately, it seems that they haven’t fixed the problem yet. Rafael Riviera, the man who spotted the problem to begin with, is saying that Yahoo! haven’t solved the problem yet, tweeting this:
34 days later, @Yahoo still hasn’t updated their IMAP server; data usage issue remains #wp7
Call me cynical, but to me it looks like Yahoo! really doesn’t care if they force you over your data limit, and cost you extra money. Time to migrate services if you’re with them for email?