I think the main reason why Apple is not interested in competing in the business world is that the business world buyers are not those that actually use the device. Apple's strength has been its focus on the people actually using their devices, and they stumble hardest with things that need to be device-independent, such as with iCloud.
This is what drove Apple's success with the iPod, then the iPhone and the iPad: instead of chasing feature lists, they concentrated on how the device would actually be used. This is especially true of the iPhone, as Apple was selling them to the customers, whereas Nokia, Motorola and the established manufacturers were still selling to the telecoms.
I do see a lot more Macs and Mac OS X in the office, but that is because developers have been able to choose their own devices recently. Those that stick to non-Apple hardware prefer Ubuntu as their desktop OS, but I must add as a caveat that I work in web development, where Posix compatibility is important for backend development, and the Mac has multiple ways to run Windows with VM's and through Boot Camp.