Metso wins a patent infringement lawsuit in the United States

Metso Corporation's stock exchange release on December 12, 2011 at 4:00 p.m. local time

Metso has won a patent infringement lawsuit against Terex Corporation, one of
its subsidiaries and two of its dealers in the United States. On December
9, 2011, the Federal District Court for the Eastern District of New York
affirmed the jury's verdict of December 6, 2010 (see Metso's stock exchange
release of December 7, 2010), that the defendants had willfully infringed
Metso's U.S. patent relating to mobile crushing and screening machines. Due to
the willfullness of the infringement, the court doubled the original damages
award to USD 31.6 million covering the infringing sales from March 2000 through
October 2007. In addition, the defendants will have to pay for additional
compensation covering infringing sales after October 2007, which will be
accounted for later and also doubled. The final compensation for Metso will also
include interest.

In July 2011, the court issued an order permanently barring the defendants from
marketing their mobile screening machines that were found infringing Metso's

If the court decision is appealed, the lawsuit will continue in the appeals
court. Metso will book the compensation in its financial statements only after
the final outcome of the lawsuit is clear.

Metso will continue to be active in protecting its intellectual property rights
globally, acting with the objective of enhancing fair competition.

Metso is a global supplier of sustainable technology and services for mining,
construction, power generation, automation, recycling and the pulp and paper
industries. We have about 29,000 employees in more than 50 countries.

Further information, please contact:

Erica Aminoff, Senior Vice President, Chief Legal Officer, Mining and
Construction, Metso Corporation, tel. +358 20 484 3246

Metso Corporation

Harri Nikunen

Juha Rouhiainen
VP, Investor Relations

NASDAQ OMX Helsinki Ltd