Police forces across the globe made more than 75,000 requests for data on Microsoft users last year.
The stats were released in Microsoft's first transparency report, which told of how police would seek data as part of their investigations into crime.
Police in the USA topped the list of agencies who wanted to know who created specific images or other content.
In the majority of cases, Microsoft only provided basic information, including IP addresses and login names.
The requests for information applied to over 137,000 accounts on Microsoft services including Hotmail, Outlook.com, Skype and Xbox Live.
Microsoft vowed to update the report every six months.
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