Yahoo’s IMAP mail bug had been fixed. Yahoo has upgraded its mail servers so that they now respond with only the data they were asked for, rather than the 25 times higher amount they were producing before. Rafael Rivera at Within Windows noted that it had previously sent the entire message header.
The changes address a problem first discovered on Windows Phone 7 that led to a glut of data every time the devices checked mail. Later discoveries found that it also affected iPhone owners too. The bug carried the risk of running over bandwidth caps on carriers.
