Here is an interesting 'what if' scenario. How succesfull would Apple computers be if Microsoft products such as MS Office, and Adobe products, would not be available to Mac OS X?
I always believed that Linux Desktop adoption would raise faster if Microsoft and Adobe products were available to it. I speculate that sales of Apple computers would be halved if such was the case. Apple computers would still outsell Linux, mainly because it is much less buggy than Linux and benefits of some good marketing and an established aurora. But it would suffer from the absence of these fine products, like Linux is currently.