And...don't highlight bits of a fax with any color of highlighter marker! I learned this the hard way, via almost being fired because the helpful light blue marks I made on an angry fax from one of our clients turned an opague dark grey in a weeks time, blocking out everything they had once highlighted.
Imagine having to call the angry client a week after he sent the list of demands and having to ask him to reiterate what his most important points has been.
Not too good.