Microsoft has released Office 2003/XP/2000 Add-in: Office Sounds

You can install these sounds to have fun audio cues play as you work with Microsoft Excel, Microsoft Outlook, Microsoft PowerPoint, and Microsoft Word. For example, you will hear sounds when you:

Work with toolbars, scroll bars, or dialog boxes
Zoom in or out
Send e-mail
Open the task pane

Office 2003/XP/2000 Add-in: Office Sounds