ITC 2.1 Message Changes to Volume and Size Fields- REVISED START DATE of July 29, 2007

Market Data Advisory Notices

To	Market Data Distributors
From	Market Data Operations
Subject	ITC 2.1 Message Changes to Volume and Size Fields- REVISED START DATE of July 29, 2007
Notice Date	2007-07-05
Notice Number	Q2007-168
Effective Date	2007-07-29
*In response to requests from a few of our Market Data Distributors, we have moved back the start date of the following changes to allow additional development time.* CME ^® will implement three changes to ITC 2.1 market data messages, effective *Sunday, July 29, 2007* , to accommodate larger bid/ask and LAST volume/size. Please view the attached memo for more information.