mac os 7.6 (codenamed "harmony") was the last major update, released in 1997. with 7.6, the operating system was officially called "mac os" instead of "system". new features include a revamped extensions manager, more native powerpc code for power macs, more bundled internet tools and utilities, and a more stable finder with increased memory allocation. in this version, the powertalk feature added in 7.5 was removed due to poor application support, and support for a large number of older macintosh models was dropped.