As previously announced*, the Board of Directors has approved adjustments to the option expiration schedules for December 2007 CBOT® Agricultural and Financial Options as indicated below. These changes are designed to minimize holiday related scheduling issues in connection with the 2007 Thanksgiving holiday. 

-        Change the last trading day/expiration for December 2007 agricultural and financial options from Friday, November 23 to Tuesday, November 20, 2007. 

The referenced agricultural options include December 2007 Corn, Soybean, Soybean Oil, Soybean Meal, Oat, Rice and Wheat contracts. The referenced financial options include December 2007 U.S. Treasury Bond and 10-Year, 5-Year and 2-Year U.S. Treasury Note contracts.

 *Previous announcements dated December 14, 2004; February 15, 2006; January 24,February 28, March 27, May 29, June 18, September 21 and September 24, 2007.