Microsoft accesses a blogger’s e-mail without permission to track the source of a leak:

One of the revelations in this week’s case of a Microsoft worker who leaked pre-release Windows 8 software was that Microsoft accessed the Hotmail account of the blogger to whom the data was leaked. And it did so without a court order.

Your sources are not safe in Hotmail (now Outlook.com). (In fact, the standard guidance of “get online sources who need protecting offline as soon as possible” applies…)