actually we're the one who benefited from this mistake..as well as bill gates..
In the early days of the PC, when IBM was clearly in control of the PC
hardware standard, it hired Microsoft to provide most of the core software for the PC. IBM developed the hardware, wrote the BIOS (basic input/output system), and then hired Microsoft to develop the disk operating system (DOS), as well as several other programs and utilities for IBM.
In what was later viewed as perhaps the most costly business mistake in history, IBM failed to secure exclusive rights to the DOS it had contracted from Microsoft, either by purchasing it outright or by an exclusive license agreement. Instead, IBM licensed it non-exclusively, which subsequently allowed Microsoft to sell the same MS-DOS code
it developed for IBM to any other company that was interested. Early PC cloners such as Compaq eagerly licensed this same operating system code, and suddenly consumers could purchase the same
basic MS-DOS operating system with several different company names on the box. In retrospect, that single contractual error made Microsoft into the dominant software company it is today, and subsequently caused IBM to lose control of the very PCstandard it had created.