Unlike some Linux users i don't think most Mac users have a strong opinion about Microsoft. If Microsoft delivers a quality product that works well on the Mac people will use it. And Silverlight is already one of Microsoft's better products.
However, my humble anecdotic evidence suggests that most everyday Apple users are Microsoft converts and they do have very strong feelings associated with Microsoft brand, but truth be told, MS has nothing to do with their painful past experiences: crappy 3rd party Windows products pre-infected with adware, performance-killing pre-installed anti-viruses, flimsy and cheap hardware from eMachines and the likes, etc.