Microsoft is a very big company, with everything from interns and developers only with Windows experience through to seasoned nix developers.

This error is actually a good thing from point of view - it's an anecdatum that the whole* company is engaging with open source, not just the bits that know it well. This is something we should encourage and educate. The advantage of educating someone at Microsoft as that their institutional knowledge will persist some fraction of it, so that the next person that comes along is less likely to have issues.