Email notification sound won't stop

[Bolomark]

Hello, my Outlook 2007 under XP Pro notifies me when new mail arrives with a ping sound but I don't want the sound. In Tools, Advanced email options, notification is unticked. In the audio volume control, I have it on mute and still hear a wee sound. How can I stop this?

 

[henydiah]

mute your sound icon in taskbar