The smallish company I work for is in the early stages of transitioning to a new development platform as all their existing systems are antiquated. The company

The smallish company I work for is in the early stages of transitioning to a new development platform as all their existing systems are antiquated. The company doesn't have any particular dependance on Microsoft technology, and from my perspective it's a great opportunity to embrace a contemporary open source platform. Sadly the management seems to be considering that all new development should be in .Net and centralised with TFS. I can't rightly understand why anyone would want to tie themselves to this costly, closed platform when they can essentially choose anything.