According to the search results, the size of Oslo paper is 9 inches by 12 inches. This size is commonly used for arts and crafts projects, and the paper is known for its sturdiness and thickness. In Microsoft Word, the default paper size is Letter (or short bond paper), which is 8.5 inches by 11 inches, but users can customize the size of the paper by selecting "Custom size" under the "Paper" tab in the "Page Layout" menu.