Microsoft confirms Yahoo as Windows Phone 7 data leak culprit

By Tom Warren, on 1st Feb 11 7:42 am with 4 Comments

Microsoft has officially confirmed that Yahoo mail is to blame for data overuse issues.

The Windows Phone 7 data leak issue came to light in January when Windows blogger Paul Thurrott uncovered several cases of high data usage. Microsoft investigated the issue and confirmed the fault was due to a “third-party solution”. The company refused to name the solution but thanks to some investigative work from Rafael Rivera, it has been forced to admit that Yahoo mail is at fault.

Rivera sniffed out IMAP packets being sent and received from Windows Phone 7 devices and discovered Yahoo is sending 25 times as much data as it needs to. Microsoft hastily issued a statement on Monday to confirm Yahoo mail as the source of the issue:

“We have determined that an inefficiency exists in the synchronization of email between the Windows Phone Mail client and Yahoo! Mail.
This inefficiency can result in larger than expected data usage for a very small percentage of users.

  • Microsoft and Yahoo! have worked together to identify a fix, which will be rolled out in the coming weeks.
  • In the meantime, customers can mitigate this issue by following these steps:
  1. On the Start screen of Windows Phone 7, click on the arrow at the top right
  2. Choose “Settings” from the app list
  3. Choose “email & accounts”
  4. Choose “Yahoo! Mail”
  5. Click on the setting under “Download new content”
  6. Select a less frequent setting. If you are using the default setting (every 2 hours), change this setting to ‘manually’
  7. Click on the setting under “Download email from”
  8. Select a shorter time range. If you are using the default setting (the last 2 weeks), change this setting to ‘the last 7 days’

Microsoft has also identified an issue with our Exchange ActiveSync [EAS] email synchronization protocol that may affect a very small percentage of users

  • This issue can be caused by email that exceeds the mail server email size setting or is sent to an invalid email address
  • This issue can potentially affect email services that utilize the EAS protocol – Outlook and Gmail for example
  • The immediate mitigation is for users to delete mail that appears “stuck” in the outbox
  • This is currently scheduled to be fixed in a near-term end user update from Microsoft”

Microsoft is on the verge of delivering its first Windows Phone 7 update. Rumors suggest the update will go live on February 7. Microsoft is promising performance enhancements for its first Windows Phone 7 update. The update, codenamed “NoDo”, will improve application start-up and resume times and introduce the important copy and paste feature. Microsoft is also expected to detail a second bigger update in February at the Mobile World Congress show in Barcelona, Spain. Microsoft’s second update will introduce enhanced developer controls for applications and updated Silverlight components.

Thanks to WinRumors reader Scott Knight for the news tip

  • GP007

    This is good, but I bet there’s a few other little things that eat your 3G data as well, Yahoo might just be the big one though.

    • Anonymous

      I remember there was this one big data eater on my Android phone a while back, it was using up 5GB of allowance on its own in a week. Since then i had my phone stolen and replaced by another HTC Desire, and this time i can go all month on 3G and it won’t go over 500MB, trying to think of it… i will never use up my 10GB a month allowance.

  • Dylan Lewis

    That would explain why I wasn’t experiencing any “phantom data”. I only use Live, Gmail, and Exchange.

  • Scott Knight

    Your welcome.