Microsoft Outlook font is too large or too small in Reply/Forward messages

These steps address a situation in Microsoft Outlook when the message text in Reply and Forward messages are abnormally large or small. In many cases, the user did not intentionally make this change.

Microsoft Outlook for Office 365 - Windows

1. Use the slider in the bottom right of the Outlook window to adjust Zoom to your preference

Microsoft Outlook for Mac - macOS

1. Open any Outlook email message and click on the Reply button.
2. In the main menu, click on the Format > Zoom menu options.
3. Change the Zoom setting to 100% (or whatever size you prefer) and click on the OK button.