ADP to Webcast Second Quarter Fiscal 2008
Earnings Release Conference Call on February 1, 2008

Contact:
ADP Investor Relations
(973) 974-5858

ROSELAND, New Jersey -- December 20, 2007 -- Automatic Data Processing, Inc. (NYSE:ADP) is scheduled to release its financial results for the second fiscal quarter ending December 31, 2007 before the opening of the New York Stock Exchange on Friday, February 1, 2008.

ADP also will be hosting a conference call at 8:30 a.m. EST on February 1, 2008 to discuss the results for the quarter. Gary C. Butler, president & chief executive officer, Christopher R. Reidy, chief financial officer, and Elena S. Charles, vice president of investor relations, will be participating on the call.

Investors and interested participants are invited to listen to the conference call and view the accompanying slide presentation via live webcast. The webcast can be accessed through ADP's home page, www.adp.com, or ADP's Investor Relations home page, http://www.investquest.com/InvestQuest/a/adp/. In addition, the slide presentation will be available to download and print approximately 60 minutes before the webcast at ADP's Investor Relations home page. A replay of the webcast will be available for approximately two weeks after the event and can be accessed in the same manner as the live webcast.

ADP, with nearly $8 billion in revenues and approximately 585,000 clients worldwide, is one of the largest providers of business outsourcing solutions. Leveraging more than 55 years of experience, ADP offers a wide range of HR, payroll, tax, and benefits administrative solutions from a single source. ADP's easy-to-use, cost-effective solutions for employers provide superior value to companies of all types and sizes. ADP is also a leading provider of integrated computing solutions to auto, truck, motorcycle, marine and recreational vehicle dealers throughout the world. For more information about ADP or to contact a local ADP sales office, reach us at 1.800.225.5237 or visit the company's Web site at www.adp.com.

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