Outlook Best Practices: Notifications
From ITS Wiki
If you receive a lot of e-mail or are easily distracted by the notification sound that plays for incoming messages (if I hear it I “have to look” and see what the email is about), you might want to consider turning off the following:
• The new mail Desktop Alert
• The envelope icon that appears in the notification area (a.k.a. “the system tray”)
• The cursor briefly changing to an envelope
• The sound that accompanies all of the above settings
Quieting Outlook…
Go to the Tools menu, then choose Options. In the ‘Email’ section at the top of the dialog, click E-mail Options…, then Advanced E-Mail Options in the next dialog.
You can change the settings any way you would like. You can also edit some of the settings of the New Message Alert pop-up using the Desktop Alert Settings button in the same section.
This should help if a more quiet Outlook would be helpful to your productivity.

