EXHIBIT 99.1 IDC 5 Speen Street Analyze the Future Framingham, MA 01701 Voice: 508.872.8200 idc.com USA Fax: 508.935.4015 TO: Diane Pardee, Taleo FROM: Gigi Wang, IDC Date: January 28, 2005 Re: Approval to use IDC content IDC grants permission for Taleo to use the following IDC content in its S-1 Filing with the SEC. Please source the following IDC report "Worldwide and U.S. Recruiting and Staffing Services Forecast, 2004-2008, IDC#32036, October 2004." In October 2004, an independent market research firm, International Data Corporation, or IDC, estimated that U.S. recruiting and staffing services spending would grow from $29.9 billion in 2003 to $47.1 billion by 2008, a compound annual growth rate of 9.5%. The fastest growing component of this aggregate IDC forecast, the end-to-end hiring process automation solutions market (which IDC notes is becoming referred to as talent management as suppliers expand capabilities) is expected to grow from $239 million in 2003 to approximately $727.9 million in 2008, which represents a compound annual growth rate of 24.9%. This estimate does not include the market opportunity for temporary staffing process automation solutions, or the market for end-to-end hiring process automation solutions outside the United States. Best regards, /s/ Gigi Wang Gigi Wang Senior Vice President, Strategy IDC