Outlook rule to *not* display a notification for certain messages

Is it possible to set up an outlook rule that supresses the system tray (and envelope overlay on the Win 7 icon) for certain messages

I would like the notification for the vast majority of my email but have certain automated messages I'd like to suppress the notification for

This doesnt appear to be a rule in the available list

I've tried to move it to another folder and "mark it as read". But that doesn't seem to suppress the notification

any ideas?

1. Disable alert sounds and Desktop Notifications in Outlook's Options (so that NO messages make the alert sound/box).
2. Create a Rule that plays the same Alert sound and displays a Desktop Notification for every message received.
3. Then, you can either a) Add exceptions to the rule, or b) create other filtering rules (for example, deleting the unwanted messages) and then check off "Stop Processing Rules" on those rules; make sure they are higher up the list than your Alert rule. You'll never even know those messages ever came in.

Bit late to this one, but as it's a top hit in Google, here's what to do in newer versions of of Office...

In the rules wizard, under "What do you want to do with the message" select "Clear the message flag"