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I'd have to agree with Rayiner that secretarial staff (like the rest of us) are creatures of habit. Feed them LaTeX from the cradle and they'll never look back!
Well, I don't know about that. I use OpenOffice.org for short documents such as one-off letters. There is definitely a level of complexity at which I find it more worthwhile to switch to LaTeX.
Which is why MSOffice has been so popular in the past. It is designed around the needs of a group of people who produce large quantities of short one-time reports and letters.