System 7 (Mac OS)
System 7 is an operating system from Apple and was released in June 1991. It comes directly from the Macintosh system software, as it was introduced on the first Apple Macintosh in 1984. The "System Software" version 7 follows on System 6 (also "Macintosh System Software 6") and is the first version, which was from January 1997. System 7 is the only Macintosh operating system ever licensed for non-Apple computers, "Macintosh clones".