When a new email arrives, Outlook displays a desktop alert in the bottom-right of your screen. It looks like toast popping up from a toast, or rather fading in from an ethereal desktop toaster. The problem is that it can be terribly distracting. One of the benefits of email is the offline “I’ll deal with it in a batch when I get a moment” nature. That is one of the main distinguishing factors between email and instant messaging. The problem with the toast notification is that it draws it to your attention the moment the email arrives.
Disabling the Notification
In Outlook 2010, you can disable these notifications by navigating to File->Options->Mail. From here scroll down to Message arrival and uncheck options Briefly change the mouse pointer and Display a Desktop Alert. Much better.