Want everyone's attention? Then listen to Lifehacker and take advantage of the fact that most email clients preview about 50-75 characters of a message in the inbox view by making your opening line sound like a tweet.
A Hacker Is Reportedly Selling Hundreds of Microsoft C-Suite Email Credentials for As Little as $100
Long ago in another life I filed lots of incident reports, and I learned to be very concise and precise in my writing. It's been a hard habit to break, and most people prefer to read notes and emails written more "verbosely." But my abbreviated style has come in handy with Twitter.