I would say that you could. In theory, all contractions are less formal than the full length version of words, but the word doesn't is used so commonly that it really wouldn't matter to anyone if you used it.
NO!!! 'doesn't' is an informal word for 'does not'.
it is not unusual to say "in fact," in a formal lettter
yes it is formal because it doesnt use slang and too much puncuation the lonely planet guide does use puncuation but not too much unlike the email
One would use formal language in a business letter because it is a formal means of communication. When writing a business letter, one wants the tone to be professional. Formal language can help the writer to achieve this.
i would use a semi colon ; just because that is More formal.
use formal and semi-formal language
respected
Well, you use thank you either if it's a formal letter (and in any part of it) or not while you normally use best regards at the end of a formal letter
it doesnt.
Informal letter uses a short forms while semi formal use a very limited short forms.
a letter to your congressional representative. *apex homie*
Use Formal language.
format for formal letter