So Microsoft released its .net framework to the public yesterday, the foundation for every modern Microsoft solution made in the past 10* years. The response for them has been outstanding and finally they will be getting a bit of respect from other OS developers, who have in general, shunned Microsoft.
What seems to be missing from the coverage of the announcement is that Microsoft has been pro open source for quite awhile now and this happening to the .net framework has been on some peoples radar for quite some time.
Although not fully involved from the beginning Microsoft now plays a large role in Mono, the linux fork of .net and works closely with that community to make it better. They will be delighted with the news that the new .net will be compatible across all major operating systems.
Also Microsoft itself has been open source orientated with its Asp.NET team since 2009 releasing its first Asp.NET MVC framework under the Microsoft Public License. Combined with the website Codeplex, which hosts open source software in a fashion similar to github, and Dreamspark that gives away free software. Microsoft as companies go, was doing a really good job at helping its community grow.
Then in January this year** they announced that asp.net was finally going open source!!!... wait it was already open source. What they really meant is that they were going open source under a license everybody liked (The Apache license in this case). People are fickle sometimes and this was all that was needed to help guide Microsoft to a new era where openness is a big part of the company.
Hopefully people will look at the deeds Microsoft has done from now on and judge them a little less. Compared to other companies (One with a logo of fruit springs to mind) they are doing quite well. They may never be like Ubuntu as they are a company for profit in the end but they are learning from the linux community a lot thanks to frameworks like Mono.
* 13th February 2002 - .net initial release date.
** 19th January - Entity framework github
Announcing .NET 2015 - .NET as Open Source, .NET on Mac and Linux, and Visual Studio Community