Microsoft

Let's face it guys. No matter the technical excellence of newcomers to the IT field, they've still got to deal with MS. I know all the anti-MS arguments - and in lots of cases I agree with them, but being a successful company and being able to provide support, updates, technical info, partner/channel support, etc... for the long run isn't easy. It takes a stable 'MegaCorp' to pull off professional business activities and so far OSS and the quick acquisitions can't seem to do it.

Best of luck to them though.