[ryne]

I've used Open Office in the past and advocated it to my friends but I hypocritically use Office. The ribbon for all it's criticism seems to be highly functional, aesthetically pleasing and usable (using pictorial representations that aren't 16x16). There's a "Save as XPS/PDF" plugin for Office as well, no one has mentioned which works fine. I only use LaTeX for technical documents with a lot of math, but the Office equation editor does the job nicely with a few quirks here and there though. My only qualm is the lack of ligatures and kerning in Office, which will hopefully be added in '10.

[CyberFonic]

I would think that for touch typists (those that avoid the mouse) Latex is more productive that Office. The typesetting is far superior.