Go to Tools > Preferences > E-mail Options > Advanced E-mail Options. At here, tick to enable the sound or untick to disable the sound at Play a sound under When new items arrive in Inbox.
Turn On & Off Outlook 2007 New Email Notification
Go to Tools > Preferences > E-mail Options > Advanced E-mail Options. At here, tick to enable the sound or untick to disable the sound at Play a sound under When new items arrive in Inbox.
