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Outlook Classic
1. Insert an image into your email

2. Right-Click on the image
3. Select the "View Alt Text..." option

4. Type 1-2 sentences describing the object.

New Outlook/Web Outlook
1. Insert an image into your email
2. Right click on the image
3. Click "Add alternate text" option

4. A window will appear and allow you to type a description for your image.
