"In 2008, Microsoft hired Hamilton "Hammett" Verissimo, the
founder of the open-source Castle Project, as a program manager on
the Microsoft Extensibility Framework (MEF) team in the company's
Developer Division. On May 17, 2011, Verissimo quit Microsoft.
"People join and leave Microsoft every day. (In fact, the last
of the original Xbox founders submitted his resignation from
Microsoft this week.) But I was interested in hearing from
Verissimo whether it was a conflict in open/closed source
philosophies that led to his decision to go. It turns out many of
his frustrations are similar to ones I've heard shared by those
leaving Microsoft whether or not they were in the open-source
Some of the products that appear on this site are from companies from which QuinStreet receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. QuinStreet does not include all companies or all types of products available in the marketplace.