what Microsoft did to stop Lotus
This is actually urban legend. Never happened. Pure myth. Remember, Microsoft was, in the DOS days, utterly dependent on Lotus to sell PCs. Every Lotus employee involved at the time also deny there ever was such a problem.
Lotus 1-2-3 dies because Excel was a (in areas vastly) superior product. It certainly had its flaws, but from a usability standpoint it blew Lotus out of the water. You only have to look at the Apple side of things. Lotus Symphony and Excel existed at the same time on the Mac, and I would guesstimate that Excel outsold Lotus on Apple by about a million to one.
This isn't even an urban legend. This never happened, and there isn't even a myth that it did.
Word Perfect committed suicide. Word Perfect on Windows was a deeply flawed product. It was, for any windows user, a usability nightmare. The morons insisted on staying with WP shortcuts and their own (horrible) menu system despite the fact that nobody wanted it. Refusing to change, and at the release of Microsoft Word 2.0, which was a far inferior product from a technical standpoint, but good enough for 97.5% of all use-cases, WordPerfect was dead. By moronic suicide. WP refused to go the proper Windows route, their product (on Windows) was buggy as to be unusable until version 6.0a and by then the fight was over.