Wausau Paper Files 2006 Annual Report on Form 10-K

MOSINEE, Wis.–(BUSINESS WIRE)–March 16, 2007–Wausau Paper (NYSE:WPP) has filed its Annual Report on Form 10-K with the Securities and Exchange Commission for the fiscal year ended December 31, 2006, and posted an electronic copy on its corporate Web site. A printed copy of the 2006 Annual Report on Form 10-K, including complete audited financial statements may be obtained, without charge by visiting the “Investor Information” page of the Wausau Paper corporate Web site, www.wausaupaper.com, sending an e-mail to ir@wausaupaper.com or by sending a written request to Investor Relations, Wausau Paper, 100 Paper Place, Mosinee, WI 54455.

About Wausau Paper:

Wausau Paper, with record revenues of $1.2 billion in fiscal 2006 produces fine printing and writing papers, technical specialty papers, and “away-from-home” towel and tissue products. To learn more about Wausau Paper visit: http://www.wausaupaper.com.

Safe Harbor under the Private Securities Litigation Reform Act of 1995: The matters discussed in this news release concerning the company’s future performance or anticipated financial results are forward-looking statements and are made pursuant to the safe harbor provisions of the Securities Reform Act of 1995. Such statements involve risks and uncertainties which may cause results to differ materially from those set forth in these statements. Among other things, these risks and uncertainties include the strength of the economy and demand for paper products, increases in raw material and energy prices, manufacturing problems at company facilities, and other risks and assumptions described under “Information Concerning Forward-Looking Statements” in Item 7 and in Item 1A of the company’s Form 10-K for the year ended December 31, 2006. The company assumes no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

      CONTACT: Wausau Paper              Investor and Media Contact:              Perry Grueber, Director Investor Relations, 715-692-2056              Fax: 715-692-2020      SOURCE: Wausau Paper