Exit Outlook 2010.
Click Control Panel.
The easiest way to change sounds is to open Control Panel in Windows, and then in the Search box at the top of window, type Sound. In Control Panel for Windows XP, type Sound in the Address box.
Do one of the following:
Windows 7 and Windows Vista On the Sound dialog box, on the Sounds tab, under Program, under Windows, click New Mail Notification.
Windows XP On the Sounds and Audio Devices Properties dialog box, on the Sounds tab, under Program, under Windows, click New Mail Notification.
Click Browse, and then select a different .wav audio file.
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