When IBM earmarked billions of dollars to get into computers in the 1960s, many people found it extravagant.
Then it did the unthinkable and sold its PC business to Lenovo in 2005.
That's one company which has kept reinventing itself. But that might be an unfair comparison since IBM has been around in one form or the other for more than a century.
Microsoft is known for its perpetual stranglehold over the OS market with Windows. But it also won the browser war with Netscape.
That's not all. It entered the gaming console market quite late and despite that the Xbox 360 has sold close to 60 million units while Halo 3 sold close to 15 million.
Nothing compares to Apple.
From its core business of PCs, it quickly gained monopoly over the MP3 player market with innovations like iTunes as a bonus.
Then it became a big player in the smartphones market too.
You definitely need more than one thing going for you in the IT world to have a really long-term existence.
Images: Our cartoonist Satish Acharya's salute to the man who made Apple the company it has become.