DESKTOP: How do I turn off my desktop alerts so they do not display while I am teaching?

DESKTOP:
How do I turn off my desktop alerts so they do not display while I am teaching?
To turn on or off Desktop Alerts, do the following:
1. Open Outlook
2. Click the File tab.
3. Click Options.
4. Click Mail.
5. Under Message arrival, select or clear the Display a Desktop Alert check box.
NOTE To suppress other notifications such as playing sounds, changing the mouse pointer, or displaying an envelope icon in the taskbar, clear the respective check boxes for those functions.
You can also turn off Desktop Alert when one appears on your screen. Click the down arrow on the alert, and then click Disable New Mail Desktop Alert.