The legal action against Microsoft has lasted for more than two years. The outcome will potentially shape the future of consumer computing, communications and the internet.
Click on the stories below to read BBC News Online's extensive coverage of the trial's key moments.
April 1, 2000: Talks break down
Attempts to reach a settlement are abandoned after more than four months, with the mediator saying the differences were too great to be breached.
September 22, 1999: Microsoft knows "no limits"
The US government winds up its case by saying that Microsoft was a company that didn't know when to stop but the company hits back alleging "red herrings, mis-statements and omissions".
June 1, 1999: Microsoft 'bribed' companies
Microsoft used its monopoly to give away the Internet Explorer browser in an attempt to force competitors from the market, a senior academic tells the trial.
April 28, 1999: Microsoft deposes competitors
The software giant calls in witnesses from America Online and Sun Microsystems in an effort to prove that Microsoft faces a tough battle for survival against a determined opposition.
February 12, 1999: Lemon Dog vs Microsoft
How one Scottish software company launched a bold challenge to the largest computer company in the world - and won a settlement.
January 12, 1999: Microsoft begins its defence
Microsoft's rebuttal of the US government's allegations begins with a closed hearing to allow testimony from Dell and Compaq, neither of which want to reveal how much they pay Bill Gates' corporation for Windows.
November 10, 1998: Microsoft 'tried to influence Intel' Microsoft tried to persuade the world's largest computer chip manufacturer, Intel, to use a Microsoft-developed version of the Java programming language, an Intel executive tells the court.
October 28, 1998: Microsoft defends 'visionary' Gates
Microsoft opens its defence case and accuses the US government of a personal attack against Bill Gates - and adds that it is the consumer that has already chosen the Windows operating system.
October 21, 1998: Microsoft turns defence into attack
Lawyers for the software corporation allege that rival Netscape attempted to reduce competition in the Internet browser market - rather than Microsoft as charged by the US government.