1.) Setting the High Importance flag on EVERY E-mail

2.) Replying to an e-mail thread with a totally different conversation

3.) Doing 2 without changing the subject of the e-mail

4.) No subject

5.) Using the same subject for 3 different e-mails on three different topics

6.) Including too many people in an e-mail chain

7.) Having to retain e-mail forever because the documentation doesn’t live anywhere else

8.) Those damn e-mail forwards

9.) Signatures that are longer than 3-4 short lines (just this week, I got a signature with 12 lines and with 8 )

10.) Calling or stopping by less than a minute after sending an e-mail to talk about the e-mail