What was the first mass-produced program writtenby Bill Gates company?

The first mass-produced program written by Bill Gates' company, Microsoft, was a version of the programming language BASIC for the Altair 8800 microcomputer. Released in 1975, this software laid the foundation for Microsoft's future success and established the company as a key player in the burgeoning personal computer industry. The Altair BASIC allowed users to write programs in a more accessible way, significantly contributing to the rise of home computing.