Houghton Mifflin Co. - 02/23/06

Houghton Mifflin Company Announces Fourth Quarter and Year-end 2005 Results Conference Call

BOSTON—February 23, 2006—Houghton Mifflin Company management will host a conference call for analysts and investors to discuss fourth quarter and full-year 2005 financial results on Thursday, March 16, 2006, at 10:00 a.m. EST.

Teleconference dial-in numbers:
United States: 866-322-2542
International: 706-634-7466
Conference ID: 5806847

The teleconference will be available for replay starting on March 16, 2006, at 12:00 p.m. EST and ending on April 16, 2006, at 11:59 p.m. EST.

Replay telephone numbers:
United States: 800-642-1687
International: 706-645-9291
Conference ID: 5806847

Houghton Mifflin President and Chief Executive Officer Tony Lucki and Executive Vice President, Chief Financial Officer and Chief Operating Officer Steve Richards will lead the call.

About Houghton Mifflin
Boston-based Houghton Mifflin Company is one of the leading educational publishers in the United States, with more than $1 billion in sales. Houghton Mifflin publishes textbooks, instructional technology, assessments and other educational materials for elementary and secondary schools and colleges. The Company also publishes an extensive line of reference works and award-winning fiction and nonfiction for adults and young readers. With its origins dating back to 1832, Houghton Mifflin combines its tradition of excellence with a commitment to innovation. The Company's Web site can be found at www.hmco.com.