How to change the font size of the message body received in outlook?

1. Take outlook20 10 as an example, as shown in the following figure. After logging into the mailbox, click "File" in the upper left corner of the page and click "Options" in the pop-up box;

2. In the pop-up Outlook option setting box, click "Email";

3. Then click "Stationery and Font" in the mail setting box on the right;

4. Click "Font" below the new email, select the desired font size in the newly popped up box, and finally click OK below;

5. You will return to this interface and click OK in the lower right corner to complete the font size setting.