The culprit in the Windows Phone 7's data issues turned out to be Yahoo! Mail, as many suspected.  (Source:
Microsoft offers a fix to its Windows Phone 7 users who run the offending app

Microsoft has finally gone public with the "third party" behind the phantom data menace afflicting a "single digit" percentage of its Windows Phone 7 smartphones.  That app is Yahoo! Mail (previous speculation that HTC apps might be implicated now seems incorrect).

Microsoft writes:

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’
9.  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

Not everyone is satisfied with Microsoft's response.  Paul Thurott, who runs the Windows SuperSite, and is typically a strong Microsoft defender/proponent writes, "I realize I’m just stating the obvious, but there’s no reason, and no excuse, for this information to not have been provided earlier."

Average cases involved approximately 10 MB of excess data transferred a day.  The Seattle Pi claims that one customer experienced an incredible 50 GB of data use in a single day.  That would represent near-continuous transmission over good signal conditions, and would necessitate the phone to be plugged in (or the battery would have gone dead), nonetheless, its an extreme example of this frustrating issue that has been plaguing Microsoft and its users.

Now that the WP7 platform has its data issues behind it, it can focus on bringing the platform to the Sprint and Verizon's networks.  It can also focus on rolling out updates to fill in missing functionality like third party multitasking support and copy and paste.

"I f***ing cannot play Halo 2 multiplayer. I cannot do it." -- Bungie Technical Lead Chris Butcher

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