Yahoo! Mail Bug to Windows Phone 7 fixed with IMAP Patch
Now to solve the problem an IMAP patch has been released, the unnecessary data usage from WP7 was a mystery. as the problem known as from Yahoo Mail dedicated server the solution for the problem has been available thanks to Yahoo.
According to report the latest Yahoo mail app doesn’t suffer from excess data usage anymore, if you have downloaded new Yahoo!Mail app please feel free to share your experience with us.