Awhile ago, it was reported that Yahoo! Mail was causing Windows Phone 7 devices to unnecessarily use data even when the phone was idle, leading to enormous data consumption from the device. Well it appears that the latest version of Yahoo! Mail has fixed this issue. It wasn’t mentioned what was changed, but according to reports, the latest version of the app doesn’t suffer from the data-eating issue anymore. Head over to the Windows Marketplace to download the latest version of Yahoo! Mail if you haven’t got it yet.