Microsoft has asked the US Court of Appeals not to allow its competitors to file briefs in its appeal of a judge's ruling to break the company in two.
The filings, called amicus briefs, allow parties not involved directly in a case to submit arguments on behalf of the defendant or the plaintiff.
The court earlier said it would accept two amicus briefs - one from supporters of Microsoft and the other from the US government. America Online (AOL) and three US trade associations, which represent rivals such as Sun Microsystems and Oracle, are among the organisations that have asked to make such filings.
In a filing, the US Department of Justice said it supports the court's decision to allow amicus briefs, but Microsoft argued that AOL and the trade associations should be permitted to file a single, joint brief.
"Any other outcome would be unfair to Microsoft and unduly burdensome to the court," said lawyers representing Microsoft.
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