The 451 Group posted a news story that the OSI Board has approved the Microsoft Public License (Ms-PL) and the Microsoft Reciprocal License (Ms-RL) as satisfying the criteria of the Open Source Definition

"For some, this announcement is confirmation that the sky is falling and the end of the world is nigh. For others, it represents the conclusion to a process that has seen Microsoft engaging with the OSI on the OSI’s terms and showing that it is willing to be flexible."

>> OSI approves Microsoft licenses