Windows Enthusiasts like to spin Apple's support for Exchange on the iPhone and in Snow Leopard as endorsement of Microsoft in the server space. From another angle, Apple is reducing its dependance upon Microsoft's client software, weakening Microsoft's ability to hold back and dumb down its Mac offerings at Apple's expense. More importantly, Apple is providing its users with additional options that benefit both Mac users and the open source community. Here's how, the fourth in this series looking closer at some of Snow Leopard's well-known, but often misrepresented or misunderstood features.