Not
We have announced that our upcoming Mono release (2.8) will default to 4.0:
http://www.mono-project.com/Roadmap
For the first time in Mono's history our C# compiler and its supporting engine and core libraries were done before Microsoft released the product, we were usually one to two years behind. This time we are some five months ahead of time:
http://tirania.org/blog/archive/2009/Dec-09.html
There are still a handful of loose ends here and there, but luckily, nothing major.
.NET was released in July of 2000.
And Google uses a mix of languages and tools: different features require different tools and all that. Had there been no legal problems, it would have been a no-brainer to use
It did not have to be Mono, it could have been a third party
Rather, submit patches to replace System.Data with Sqlite-net and you have protection from Microsoft patents on
If I set here and stare at nothing long enough, people might think I'm an engineer working on something. -- S.R. McElroy