Outlook 2007: How To Prevent the New Mail Desktop Alert from Appearing
Contributed by Rob Rogers 
Tagged: Microsoft Outlook By default, Outlook 2007 automatically pops up a Desktop Alert to show part of a new message that has just been received. To prevent others from viewing your incoming e-mail, you can disable it. To do this:
1. Right-click on the Outlook icon in the Notification Area, next to the clock.
2. In the resulting menu, uncheck Show New Mail Desktop Alert.
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Lina said on September 15, 2011
What about if the Outlook icon does not appear in the Notification Area?