The 10.3.6 Server Update delivers enhanced functionality and improved reliability for Mac OS X Server v10.3 and is recommended for all systems. Key enhancements include: ...

With OS X Lion Server, Apple is blurring the distinction between client and server operating systems. To John Welch, that's not a bad thing.

Apple’s policy on virtualization allows properly licensed copies of Mac OS X Lion (client or server), Leopard Server, and Snow Leopard Server to be virtualized on Apple-branded hardware.

Tips on tracking OS upgrade costs A network-wide client OS upgrade can be fraught with unexpected expenses and lost productivity.