Effective Sunday, February 4, 2007, CME Foreign Exchange (FX) and Commodity Options traded at cabinet prices will be transmitted at actual cabinet value for RLC message users, only .  ITC 2.1 users are not affected by this change and will continue to represent cabinet prices as zeroes (0) for these products with the appropriate cabinetindicator.

Currently, option orders traded at zero (0) price are treated as cabinet prices.  As a result of this change, any option orders submitted at a price that is between and including zero and the lowest allowable (non-zero) tick value for the contract will be rejected.

The actual cabinet values will be transmitted via the Instrument Creation (MO) market data messages in positions 625-643, Low Limit.  Users can verify actual cabinet values for each contract at www.cme.com/contractspecs.

Certification Testing

Users wishing to test this change can do so in the certification environment on Sunday, January 21^st.

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

Thank you.