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Ars Technica posted a news story that Microsoft has issued a vague response to say that the company has determined the cause of excessive Windows Phone 7 data use issues



In a statement given to SeattlePI, the company says that the configuration of a "third-party solution" is causing the operating system to transfer many tens of megabytes of data each day.

As for a fix, Microsoft says that it is contact with the third party to assist them in making changes to their systems to resolve the problem, and is also pursuing "workarounds" in case they are necessary. The statement did not offer any particular timeline for when these changes would be made.
  Microsoft blames Windows Phone 7 data usage issue on unnamed 3rd party