4. Mr. Credentials
"As someone who has managed Windows-based systems for 15 years," Mr. Credentials weighs in with a predictable approach. First he encourages everyone to focus on his superior CV, rather than on the objective reasonableness of his views. Then he'll launch into a 500-word essay designed to show just how well-versed he is on the subject at hand (or whatever subject he wants to talk about), overwhelming all resistance with the sheer force and volume of his hot air.
And in case his own credentials might be called into question at some point when he has paused to breathe, Mr. Credentials likes to cite his authorities by the bushel--quoting them at length, and often adding further excerpts detailing his authorities' authorities. In fact, his messages are frequently more heavily weighted toward text from famous figures, user manuals, or Wikipedia entries than toward his own original thoughts or opinions.