Does written communication meaning change when it is the form of an email or a letter or a memo?

Answer 1

Letters are usually more formal than emails or memos. The meaning may changed based on the level of formality in any piece of writing.

http://www.google.com/search?q=formal+writing&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

http://www.google.com/search?q=informal+writing&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a