I thought this was pretty interesting - compiles MSIL into Java Bytecode so you can run C# or VB.NET (or any other . NET language I assume) on J2EE application servers. At first glance, the question qhich arises is 'why the hell would I want to do this?' but think about iot, large corps have huge investments in existing Sun etc... hardware which already has pretty expensive (usually £80k+) application servers. Anyway, the way I noticed this was this link from the BBC looks like there's a chance (though no proof at the moment) that Mainsoft could be the source of the leak...shame if this impacted what looks like a really interesting product...anyway, here's the bit from the BBC article:

In files found with the chunk of source code is information that points to Mainsoft engineers.

Attention is focussing on a file called a "core dump" that is created during a crash and helps programmers work out what went wrong.

Mainsoft said it would cooperate fully with the investigation into the leak.

"Mainsoft takes Microsoft's and all our customers' security matters seriously, and we recognize the gravity of the situation," said Mike Gullard, chairman of Mainsoft.

Experts say that a mention of Mainsoft in the code does not mean the company is the source of the leak.