Amid the row over whether Microsoft will be fined $2.4m a day for failing to comply with an EU Commision ruling, we now hear that computer makers have complained to the Commision.

Jonathan Todd, the Commission’s spokesman said: “Several companies have expressed their concerns to the Commission concerning Microsoft’s Vista operating system.” It seems there are no formal complaints but that the Commission was “monitoring the situation.”

This follows a court filing in the United States, in which the Justice Department said it had received a complaint concerning Windows Vista.

“As with any Commission antitrust decision that established clear principles, the Commission expects Microsoft to respect the principles established by the March, 2004, decision when designing and implementing Vista,” Todd said.

Reuters reports: “The Commission found in March, 2004, that Microsoft had broken European antitrust laws, fined it 497 million euros ($595 million) and ordered it to change its business practices”.

The Justice Department, anticipating Todd, said it was continuing to “monitor the situation”.

Microsoft spokesman Jack Evans said at the time the company had discussed the design of Windows Vista with all of the top 20 PC manufacturers and nearly all of them were satisfied with its approach.