I love this question and answer, from today's paper:
Dear Miss Manners:
Today we received the following admonition in our office e-mail. The gentlemen who sent it is new to his supervisory position in our office and was transferred to his position from a former post in computer services. "Please do not send any e-mails in all capitol letters. This is very rude and unprofessional. Much like we don't allow yelling in the office, we should not be yelling in our e-mails."
Aside from the misspelling of "capital," is this statement true? Not that any one would type in capital letters, but if she did, is it truly seen as yelling, rude and unprofessional?
Well, as a matter of fact, YES, IT IS. (You see? And do forgive Miss Manners for dramatizing the point.)