Apple dropped ZFS support from Mac OS X because of licensing problems?
Online sources claim that Apple decided to drop support for ZFS file system because of potential licensing problems with Sun Microsystems.
Sun had developed this file system for their Solaris platform. It was supposed to be supported in the latest edition of Mac [...]

Snow Leopard Server to feature ZFS before Desktop edition?
AppleInsider has reported that Apple would first implement the expanded support for ZFS in the server edition of Mac OS X Snow Leopard before it is added to the desktop edition.
Mac OS X Leopard already has read only support for this new 128-bit file system which was [...]