This Saturday, November 1, 2008, the replay of production-speed market data in the production environment for both FIX/FAST and RLC formats will be from 12:30 p.m. -1:30 p.m. instead of the previously announced schedule of 11:30 a.m. to 12:30 p.m. Central Time (CT).

We recommend that all Quote Vendors purge and reload their instrument databases every week. To support testing during these replay windows, the FIX/FAST Security Definition (tag 35=d) and RLC Instrument Creation (MO) messages from the prior week will be available on the instrument definition channels each Saturday morning starting at 10:00 a.m.

Support will be available at 312-715-6003 should Quote Vendors have any questions or concern during the Saturday replay window.

Please contact mdo@cmegroup.com if you have any questions concerning this notice. Thank you