Actually MS was the one to first challenge National Security Letters. Moreover if it was found out that they had left a back door in it would result in the loss of billions of dollars in business, from Europe alone. Whereas Kaspersky very clearly will always have a Russian government/corporate client.
Are you sure Microsoft was? I thought Yahoo did. I can't find the reference now (Google is full of references to Yahoo being the first to disclose an NSL), but I seem to remember something from 2008-2009 era and Microsoft's challenge was in 2012-2013 era if memory serves. Not that this matters much in the grand scheme, but I'd still love to know which company really has that distinction. Links appreciated if you find one!
I suspect you're right, that said Yahoo has lost all respect from me after they've basically turned over everything without question after Mayer became CEO. In all honesty it's very hard to tell because the challenges are secret and sealed for the most part.
