First launched in October 2001, within five years over 400 million versions of Windows XP had been installed on computer systems around the world.
Now, on the day that support finally ends for the operating system, it is estimated that over a quarter of all computers worldwide still run on XP.
In this week's Tech Talk, IBTimes UK talks to security experts to find out what this means for the millions of people and businesses still using Microsoft's most popular ever operating system.
