The European Commission is considering whether Microsoft has complied with its 2004 anti-trust judgement by handing over its complete Windows Server source code.
Microsoft was struggling to meet the EC deadline for delivering the documentation associated with its Windows workgroup server protocols.
The demand was designed to make it easier for Microsoft competitors to build competing server products that could work in Windows environments.
The documentation previously handed over was not up to the standard required by the commission, which had threatened to fine Microsoft £1.4m a day for failing to comply.
In an unusal move Microsoft decided to dump the entire code in the commission's lap to settle the matter.
It reckons that by doing this its competitors will be able to license all the code they need to build Windows interoperability into their products.
However, the commission has already pointed out that programmers of code normally accompany that code with documentation, so Microsoft may not be out of the woods yet.