Also

* Microsoft Corp. is asking U.S. courts to compel Sun Microsystems Inc., IBM Corp., Oracle Corp. and Novell Inc. to hand over correspondence with European Union regulators on Microsoft’s antitrust battle in Europe.

* Former Qwest Communications International Inc. executive Marc B. Weisberg was fined $250,000 and sentenced to 60 days of home detention after pleading guilty to wire fraud.

* Wal-Mart Stores Inc. said it planned to hire an executive to oversee corporate ethics issues after the company’s vice chairman pleaded guilty to fraud and tax evasion in January.

* Warner Music Group Corp. confirmed that the Justice Department had requested information relating to possible violations of the company’s pricing of downloaded music.

* Occidental Petroleum Corp. said a London court rejected Ecuador’s appeal to overturn a ruling that requires the Latin American country to pay the company a $75-million tax refund. The initial tax ruling triggered a contract dispute that threatened to shut down Occidental’s operations in Ecuador.

* Silicon Graphics Inc., a maker of computers to create special effects in movies, said it would cut 250 jobs.