Microsoft has said that Yahoo is behind the mysterious "phantom data" leaks affecting Windows Phone 7 handsets. The glitch, which was first identified at the start of the year, makes many phones send and receive data without the owner's knowledge. Some users had complained that the bug was rapidly eating up their monthly data allowances.
Microsoft, which had previously refused to name the culprit, said it was still working on a solution.
News of the problem first surfaced at the beginning of the year, with some Windows Phone 7 owners reporting that their phones were using huge amounts of data each day for no apparent reason.
Yahoo today offered an apology to Windows Phone 7 users affected by an inefficiency that left some with larger than usual data usage.
Yahoo! Mail is widely available on tens of millions of mobile phones, including those running on Apple iOS, Android, Nokia Symbian, and RIM. The issue on the Windows Phones is specific to how Microsoft chose to implement IMAP for Yahoo! Mail and does not impact Yahoo! Mail on these other mobile devices. Yahoo! has offered to provide Microsoft a near-term solution for the implementation they chose, and is encouraging Microsoft to change to a standard way of integrating with Yahoo! Mail, which would result in a permanent fix.