Apple have discontinued the Xserve completely. Their suggested alternatives are install OSX Server on a Mac Pro or a Mac Mini Server?

Neither the Mac Pro or Mac Mini Server are rackmountable. You just stick them on a shelf and call it a day. The Mac Pro takes up a massive amount of space because you can only fit two of them into 12U on a shelf.

I guess not enough people bought the Xserves to warrant Apple having it as a standalone product line. They already killed off the Xserve RAID units a couple years back.

I know some people who have racks full of Xserves doing rendering. They're not going to be thrilled about this decision by Apple but I guess they'll just have to put up with the big Mac Pros or port their software to something else if possible.