The flagship Apple Xserve is to phased out at Christmas 2010. This was a very successfuil product but has many a peculiarity and has been overtaken by the flexibility of the Tower size Mac Pro and its abilty for hardware upgarde and changes.
Apple has published a Transition Guide and believes the Mac Mini Server is the future. Apple also reckons a single Mac Mini running OSX Snow Leopard has enough power for businesses of up to 50 people. Unlike the Xserve, it won’t sound like concorde taking off and generate enough heat to warm the planet. True alternative is going to be a beefed up Mac Pro. HardSoft expect to see the Mac Pro available with Server software as standard in the New Year.