PotashCorp Board of Directors Rejects BHP Billiton�s Unsolicited Offer

Potash Corporation of Saskatchewan Inc. ("PotashCorp") today announced that its Board of Directors, after careful consideration with the assistance of its independent financial and legal advisors, voted unanimously to reject the unsolicited offer by BHP Billiton Development 2 (Canada) Limited, an indirect wholly-owned subsidiary of BHP Billiton Plc (LSE:BLT/JSE:BIL/NYSE:BBL) ("BHP Billiton"), to acquire all of the outstanding shares of PotashCorp for US$130 per share in cash.