Here's the only Apple computer officially designed to never, ever run an Apple OS. Mac OS, despite being a highly usable consumer OS, just wasn't up to the task of powering this industrial-strength, PowerPC-based network server. So Apple turned to IBM's Unix-based AIX as the operating system of choice. This $11,000-$19,000 beast wasn't a Mac; in fact, it contained a ROM that prevented it from booting Mac OS.
Considering its high price and bizarre heritage, it's no surprise that both models of the Apple Network Server are rare today. If you find one neglected in your local server room, treat it kindly.
Photos: Apple, Jenne