In my limited experience on and around the Redmond campus, I have to say I was startled by the level of ill-will some MS employees have towards Linux. Ranging from dismissal, "UNIX is nothing but a toy" to outright hatred, "Linux is evil". This seemed to only increase the closer you got to the top...

Although that doesn't necessarily mean they're doing this out of malice, I don't think it went entirely unconsidered. MS definitely likes to be aggressive when possible.