Maybe info sec drove the decision to purchase github because that was the easier way to reign in the data leak. =)

> I assumed that Microsoft has security policies to ensure that all confidential information (e.g. non-open-source code and strategic discussions) is stored on infrastructure controlled by Microsoft.

It depends on how important the code is.

I don't imagine MS will ever move Office or Windows to external servers, but a lot of other stuff is fair game.

There is always a security/convenience trade off.

Microsoft aims to make most of its money in the immediate future by convincing every major business in the world to let MS host that company's email, internal documents, spreadsheets and powerpoints on Microsoft's office365 servers.

It would be highly contradictory for MS to take the position, as a matter of policy, that it is too risky for them to ever place confidential business data onto a third party cloud-hosted SaaS system, because that is precisely the risk they are asking every one of their customers to take.

Similarly, if you have concerns about putting your company's source code into GitHub now, you should be equally concerned about putting your company's prerelease annual report on the office365 onedrive.