Tried this, however, time of display time is too short, especially if you
are away from the computer and it is switched on.
What I am looking for is the a button that used to be displayed in older
versions of Outlook. This resided in the bar across the bottom of the screen.
When an e-mail arrived a brown button (box) would appear at the bottom of the
screen and stay on until the e-mail was read.
Have you tried going to Options,Preference, E-mail Options, Advanced E-mail
Options, then click in the box next to: "Show an envelope icon in the
notification area. I hope this is what you are looking for.