By default, users receive an alert message on their desktops when new mail arrives. By enabling this setting, the alert is not displayed for new mail.
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\15.0\outlook\preferences |
| Value Name | newmaildesktopalerts |
| Value Type | REG_DWORD |
| Enabled Value | 0 |
| Disabled Value | 1 |