Oracle will "vigorously challenge" the US Department of Justice's (DOJ) lawsuit seeking to block the company's attempted takeover of rival PeopleSoft.
The company also said it would withdraw the slate of nominees it put forward for election to PeopleSoft's board at the company's upcoming shareholder meeting.
The DOJ indicated earlier this month that it was likely to object to the deal, and Oracle's decision to battle the agency in court came as no surprise to many.
Its move to drop its push for seats on PeopleSoft's board was a more unexpected twist.
PeopleSoft and Oracle had already begun a heated exchange of appeals to PeopleSoft's shareholders to draw support for their respective nominees.
Oracle said it was withdrawing the slate because it expected litigation over the deal to extend beyond March 25, when the shareholders' meeting would take place.
Had Oracle succeeded in seeding PeopleSoft's board with its nominees, those directors could have dropped PeopleSoft's anti-takeover protections and encouraged shareholders to support the acquisition.
Oracle also extended for the seventh time the expiration date on its tender offer to PeopleSoft's shareholders, which it initiated in June. The $US9.4 billion offer will now expire on June 25, an extension of the offer's earlier March 12 expiration.