ADECCO TO HOLD INVESTOR DAY ON SEPTEMBER 16, 2005 IN PARIS

Adecco to Hold Investor Day on September 16, 2005 in Paris

Chéserex, Switzerland - July 27, 2005: The Adecco Group, the worldwide leader in human resources (HR) services, today announced it will hold an Investor Day in Paris on September 16, 2005. Presentations will start at 10:15 am CET and will last until 4:15 pm CET. The meeting will feature presentations by senior Adecco executives covering the company's financial strategies, growth initiatives, business processes and key service strategies. A live webcast and replay of the meeting will be available on the Adecco corporate website at www.adecco.com.

About Adecco

Adecco S.A. is a Fortune Global 500 company and the global leader in HR services. The Adecco Group network connects up to 700,000 associates with business clients each day through its network of 30,000 employees and over 6,000 offices in 70 territories around the world. Registered in Switzerland, and managed by a multinational team with expertise in markets spanning the globe, Adecco Group delivers an unparalleled range of flexible staffing and career resources to corporate clients and qualified associates.

The Adecco Group comprises three divisions: Adecco Staffing, Ajilon Professional and LHH Career Services. In Adecco Staffing, the Adecco network focuses on flexible staffing solutions for global industries in transition, including automotive, banking, electronics, logistics and telecommunications; Ajilon Professional offers an unrivalled range of specialised branded businesses; LHH Career Services encompasses our portfolio of outplacement and coaching consultancy businesses.

Adecco S.A. is registered in Switzerland (ISIN: CH0012138605) and listed on the Swiss Stock Exchange with trading on Virt-x (SWX/VIRT-X:ADEN), the New York Stock Exchange (NYSE:ADO) and Euronext Paris - Premier Marché (EURONEXT: ADE).

For further information please contact:

Investor Relations

investor.relations@adecco.com or +41 44 878 8925