Mail Notification Alert Sound Change in Microsoft 2007

Do the following steps.

1. Start regedit.exe.
2. Go to HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\ MailBeep\.current.
3. Double-click (Default), and set its value to the WAV file to play.
4. Click OK.
5. Close regedit.
6. Restart the machine.