Rescue Operation Underway Following Accident at Windsor Mill

At approximately 1:35 a.m. this morning, an accident occurred at the Domtar Windsor Mill site when a scaffold collapsed into equipment. Three workers were injured in the accident. One worker was taken to hospital where his life is not in danger. Two workers are still trapped and efforts are being made for their safe rescue by first responders. At this time, we cannot confirm their health status. Psychological support is being offered to the workers and their colleagues.

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Police officers from the Sûreté du Québec and the mill emergency unit are on site to conduct the intervention and investigation. The CNESST has also been informed.

The investigation is ongoing to determine the cause of the collapse. Domtar is closely working with the responders in the investigation.

All measures have been taken to ensure the security of the site.

More information will be released as further facts become available and verified.

About Domtar

Domtar Corporation (NYSE: UFS) (TSX: UFS) is the largest integrated manufacturer and distributor of uncoated freesheet paper in North America and the second largest in the world based on production capacity, as well as a manufacturer of pulp, fluff and specialty pulp. The Company designs, manufactures, markets and distributes a wide range of business, commercial printing and publishing papers, as well as converting and specialty papers under recognized brands such as Cougar®, Lynx® Opaque Ultra, Husky® Opaque Offset, First Choice® and Domtar EarthChoice® Business Paper-part of a comprehensive line of environmentally friendly and ethical papers. Domtar owns and operates ArivaTM, an extensive network of strategically located paper distribution facilities. The Company employs approximately 8,500 people. For more information, visit www.domtar.com.

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Media relation Providence Cloutier Communication advisor Usine de Domtar-Windsor Phone: [phone] poste 58680