Usually, we start by typing the word Memo or Memorandum under the letterhead. (Note that there are memo templates available to you in Microsoft Word.) If there is no letterhead, start by typing up the...Usually, we start by typing the word Memo or Memorandum under the letterhead. (Note that there are memo templates available to you in Microsoft Word.) If there is no letterhead, start by typing up the name of the company on top of the page before you write the word Memo or Memorandum.