Actually, open source just means open source. The source is available, can be modified, and can be redistributed. Opensource.org even lists the MS-PL ans MS-R

Actually, open source just means open source. The source is available, can be modified, and can be redistributed. Opensource.org even lists the MS-PL ans MS-RL licenses as open source. Free software (as in beer), is a whole different matter entirely. Microsoft has only claimed to be releasing free software when that is indeed the case. As a developer for the Windows platform, I've never been mislead or under any illusions that anything is free. In fact, understanding the licensing and pricing was critical before making the decision to develop on the platform. Do I still appreciate that the source for ASP.Net MVC is available? Definitely. I even ran a fork of it for a time.