First of all, Apple could save a huge amount of money replacing Intel based servers with their own chips. Both on the CPU price, expecially the Xeons are really

First of all, Apple could save a huge amount of money replacing Intel based servers with their own chips. Both on the CPU price, expecially the Xeons are really expensive as well as on electricity consumption, probably the largest running cost of data centers. Then the gains of scale, making a CPU just of the Mac Pro would mean too low production numbers, but with data center usage would drive those up - especially if Apple also sold it to other customers, e.g. bringing the Xserve back. For the OS they could run Linux virtualized or they give the native Linux on Mac developers a hand.