CME has created a new schedule and timeline for the roll out of the Market Data Format. This service, that will utilize FIX/FAST for increased efficiency, will be available in production in Q2 of 2007 and will only impact RLC users. The Market Data Format will create significant additional bandwidth savings over the current RLC message format. This notice provides information regarding this initiative, as well, as the updated timeline for this change.

Please view the attached for more information:

http://www.cme.com/trading/get/dev/mdformat18472.html

If you have any questions regarding this notice, please contact:

Marilee Radecki                                  312.930.8193                          mradecki@cme.com

Kevin Brady                                        312.648.3653                          kbrady@cme.com