Steve Jobs vowed to destroy Google's Android operating system, and said he would spend all of Apple's money and his dying breath to do it.
The late Apple founder's anger at what he called Google's "grand theft" - referring to what he saw as Android's similarity to Apple's iOS platform - is to be revealed in an authorised biography soon to be published by Walter Isaacson.
Apple enjoyed a warm relationship with Google and its then CEO, Eric Schmidt - who at the time also sat on Apple's board - before the launch of Android, but that soured when the search giant outed its mobile OS in November 2007, ten months after Apple's first iPhone was launched.
In extracts of the book seen by news agency Associated Press, Jobs is quoted as saying: "I'm going to destroy Android, because it's a stolen product. I'm willing to go thermonuclear war on this."
"I will spend my last dying breath if I need to, and I will spend every penny of Apple's $40 billion in the bank, to right this wrong," Jobs added.
Google's OS now accounts for 48 per cent of all smartphones globally, while Apple's iPhone's market share currently stands at 19 per cent.
Apple has hit back with a covert war against Android, waged via a series of patent disputes against device manufacturers using the OS - most notably Samsung, whose Galaxy Tab 10.1 was recently banned in Australia and Germany.