Windows Phone 7 Data Leak Caused by Yahoo! Mail App
A problem exists with the Yahoo! Mail app on Windows Phone 7 it is confirmeed by the microsoft. the application uses 25 times more data than it should whilst loading up and retrieving emails. For WiFi users, it might not be a huge problem, The problem is for 3G users, it could be quietly eating away at a lot of your data allowance each month.
The problem was found by Rafael over at Windows Phone Secrets who managed to check IMAP packets being sent. By using a script to strip out encryption, he was able to find that the Yahoo mail server doesn’t respond correctly to FETCH requests which in turn, for increases the traffic actually needed by a hefty 25 times. problems also exist separately the WiFi has a habit of sometimes disconnecting and quietly switching users to 3G when they expect to be on Wireless.
Microsoft has confirmed that the findings on Windows Phone Secrets were correct and that Yahoo! Mail. it was responsible for eating up some data allowance.
Microsoft confirmed that Yahoo! was aware of the problem now and that a fix is being rolled out within the next few weeks.
Microsoft also suggest that to lessen the impact of the problem that you switch from checking emails every 2 hours automatically and switch it to manually check until the problem is fixed.