Microsoft has agreed to make changes to Windows Vista to satisfy EU regulators.

The changes won't cause a delay in the new operating system, the software giant said today, despite previously having warned they would.

The European Union is concerned about the impact of the operating system on competition, but following what was described as "constructive dialogue" with competition authorities, Microsoft said on Friday that it expected to release the software on schedule.

A European court is still considering Microsoft's appeal of an anti-trust ruling two-and-a-half years ago which found the company guilty of unfairly using its monopoly in desktop operating systems to strengthen its position in the markets for workgroup server and media player software.

The European Commission had expressed further concerns that Microsoft would use the launch of Vista to give it an unfair advantage in the security software market.

Microsoft has agreed to make a number of changes to Windows Vista in response to guidance from the EU's competition regulator, the European Commission. It has also talked successfully with competition authorities in Korea, which have also raised concerns about Microsoft's business practices, and expects to ship Vista on time in that country as well.

Microsoft plans to release the operating system to business customers worldwide in November and consumers in January. "We are excited to bring the security enhancements and innovative new features of Windows Vista to our customers and partners around the world, and we are committed to adhering to local law in every region," said Microsoft CEO Steve Ballmer in a written statement.