Google has surpassed the market capitalisation of Microsoft for the first time, underlining the transition to a web-centric technology world from one dominated by personal computers.
A slight bump in Google shares on Monday meant the company was valued at $US249.5 billion ($A241.92 billion), while a dip in Microsoft stock gave the PC software maker a market capitalisation of $US247.8 billion.
Both companies still trail behind Apple, which has built a value of over $US630 billion, largely based on the amazing success of its iPhone and iPad mobile devices.
Google was founded in 1998 after graduate computer science students Larry Page and Sergey Brin developed a new way of searching the internet.
Microsoft was founded by Bill Gates and Paul Allen in 1975 just as personal computers were starting to become widespread and became the world’s largest software maker after developing the dominant operating system for PCs.