Become the main supplier of an OS for PCs while IBM snoozes, replete with profits from existing business. Adopt the 386 processor while IBM messes about with the 286 perhaps because of sunk investment in that CPU. Make deals with the hardware makers they can't refuse and shut out any competition. Introduce the first GUI to become widely used on the machines soon to become predominant in desktop computing. Leave the superior OS/2 in the dust, and get IBM to sell Windows. Excel. Actually first came to fame on the Mac iirc, and rapidly drove out just about all other spreadsheets in its Windows guise. On its coattails came all the other applications we know today as MS Office, effectively wiping out all competitors. Get networking in the box with Windows and crush Netware and eventually Novell with it. And so it went until perhaps MS became like IBM in the 1980s and failed to see the next big thing on several occasions, or at least failed to achieve the same level of dominance as in the past in new fields. 2 cents is the suggested donation, I'll pass the hat around.