Jacobs Holding AG reports a shareholding in Adecco of 29.03%

Zurich, Switzerland, 6 December 2007: Pursuant to art. 15 and 17 of the Stock Exchange Ordinance-FBC, Adecco S.A. has received the following notification: By December 1, 2007, a group represented by the Jacobs Holding AG, Seefeldquai 17, CH-8034 Zürich, Switzerland, is holding 29.03% of the share capital of the company. For additional information regarding the purchase and sale positions please refer to the attached PDF document submitted by the shareholder (in German only). Contact: Investor Relations: Tel: +41 44 878 89 25 E-Mail: investor.relations@adecco.com --- End of Message --- Adecco SA Sagereistrasse 10 Glattbrugg Switzerland WKN: 922031; ISIN: CH0012138605; Index: SLCI, SMI, SPI, SMIEXP; Listed: Main Market in SWX Swiss Exchange;