Calibri Font
If you are having problems with some characters being displayed on CD-Ricoh610-3E05 (such as the numbers 6 and 8) you should avoid using Calibri Font.
I recently experienced a problem with some charaters not printing in a document. I then change the font to Times New Roman and had no problems.
Calibri Font is a new font for Office 2007, and is "made for Vista." So you can be sure it's a quality font.
The Newpaperclip has Instructions on changing the default font from Calibri to Times New Roman.