When I open a Microsoft Power Point File, the Aerial font looks fine. The Keynote application gives an error that the Calibri font does not exist. The Calibri font, maps to another font, which is fine. But the font that it maps to, is 100point sizes too big.
It should look like this Calibri, but it looks like thisin pages Calibri. Only 100 point sizes too large, about 136 points large.
Change the point size to waht you want. It is in the upper laft hand side of the toolbar and to the right of the font style. Some font styles that are in MS are not in yuor Mac. However, you can google MaC font styles and the are a ton of them that you can download to your Mac.