share: digg facebook twitter BRUSSELS (AP) — U.S. computer maker IBM Corp. on Tuesday offered to make it easier for competitors to provide maintenance services for its mainframe computers, a concession to get European regulators to close an antitrust probe. The European Commission, the European Union's competition watchdog, opened two investigations into whether IBM was abusing its dominant position in the market for mainframe computers in July 2010. The Commission said it informed IBM in August that its preliminary assessment showed that IBM "may have imposed unreasonable conditions for supplying competing mainframe maintenance service providers."