The crossword solutions for the term COMPETITOR IBM are MSDOS and APPLE. MSDOS is an acronym for Microsoft Disk Operating System, which was developed by Microsoft in 1981 and was the most popular operating system for personal computers until the mid-1990s. APPLE is a computer company founded by Steve Jobs and Steve Wozniak in 1976. It is known for its Macintosh line of personal computers, as well as its iPod, iPhone, and iPad products.