And they're right to do so! Come on folks, I know it's hard to admit it (especially for those of us working in IT) but the enterprise market is going to decline from here on out. Local servers and the cost of maintaining them are going to get less and less important with services moving to the cloud and support being outsourced. You'll probably maintain a local file server for a long time to come yet but that's about all for the majroity of companies. For those that need serious kit on-site a Unix-based system or, dare I say, Windows is the obvious choice and pretty much dominate that market. Even desktops are going to head that way, heck a modern netbook has enough grunt to run the vast majority of business apps these days.
Apple has seen this coming, has looked at the miniscule market share it has in this area and backed away. While a painful decision it's probably the right one in the long run and allows them to focus on the growing consumer market. Why throw more money and time at developing their share of a market that's shrinking and that, most of the time, demands lower and lower prices?