Calibri is the default font in Word 2010. Even though it looks graceful on screen, it isn’t very readable because it is a “sans-serif” font meaning, it doesn’t have the small horizontal lines at the ends of letters. These lines help guide the reader’s eye easily across the page.
To change Word’s default font to something that is easier to read, press Ctrl-Shift-F or click the More Arrow in the bottom right corner of the font group to open the Font dialog box. Perhaps change the font to something like Ariel or Palatino Linotype, 12 point. Click Save as Default and then choose “All documents based on the Normal.dotm template,” Click OK to complete the customization.
If you are bothered by the way Word 2007 and 2010 have changed their line spacing, you can change this setting the same way you changed the default font. Press Alt-O, then P to open the Paragraph dialog (or click the More Arrow in the Paragraph group on the Home tab). Set spacing and other options, and click Save as Default. Go to the Page Layout tab, click the More Arrow in the Page Setup group to open the Page Setup dialog. Set margins and other page-layout settings, and click Save as Default.