On the next two Saturdays --   June 17 and June 24, 2006 -- CME will conduct mock trading sessions in the CME production environment to support the upcoming UDS Phase I: Covered CME Eurodollar Options launch.  This data, which includes the new MU message, will be sent on Channel 10, and the replay messages will be sent via Channel 19 of the Market Data Platform (MDP).   The mock trading sessions will take place from approximately 10:00 am to 11:00 a.m., Chicago Time.

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.