"4. Grammar check and Spell check. USE THEM. Most documents and emails that I see do not pass the English legibility test, and many of those come from highly paid executives! It does not matter if English is your first or second language, most people fail the reading, riting, rithmatic test when it comes to grammar and spelling.
5. Refer point 4. I cannot stress this enough."

Speaking as a former English teacher, editor, and tech writer, agree 100%...but TURN OFF the "as you type" option. CONCENTRATE ON YOUR WRITING. Run these functions AFTER you've composed your message.