ON THIS DAY
On this day: the IBM-Microsoft contract that created the PC industry
August 12, 1981 — the compromise that built a trillion-dollar company.
The PUBlish Desk · 13 April 2026
On August 12, 1981, IBM introduced the 5150 Personal Computer. What's less remembered: IBM licensed the operating system from a 25-person company in Bellevue, Washington called Microsoft, on a non-exclusive basis. They kept the hardware rights. They gave away the software.
The logic at the time was rational. IBM's entire business was hardware margins. Software was a cost of goods. Licensing MS-DOS non-exclusively let Microsoft sell to clone manufacturers, which grew the market, which grew PC demand, which was good for IBM.
It was also the single decision that transferred the center of gravity in personal computing from New York to Seattle and never returned.
Every operator makes a version of this call. Keeping the hardware because that's where the margin is. Giving away the data because that's a support cost. Licensing the thing that seems like a side act.
The side act is often the main event.
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