The IBM System/360 Model 67 (S/360-67) was an important IBM mainframe model in the late 1960s. It first shipped in July 1966. Unlike the rest of the S/360 series, it included features to facilitate time-sharing applications, notably virtual memory hardware and 32-bit addressing. The S/360-67 was otherwise compatible with the rest of the S/360 series. The S/360-67 was intended to satisfy the needs of key time-sharing customers, notably MIT, where Project MAC had become a notorious IBM sales failure. The S/360-67 was essentially a general-purpose version of the customized system that IBM bid in its Project MAC proposal. Multiprocessor configurations of the S/360-67 were available; for example, in 1968, the University of Michigan installed the dual-processor version of the S/360-67 for its ageless MTS system (which had been moved in 1967, from a S/360-50, to a uniprocessor S/360-67 with paging and a high-speed drum).