Learn ways to increase your Outlook email text size, including using Microsoft 365’s new Remember My Preferences option. Many of us struggle with reading content on our screens.

Some users of Outlook face a problem, then when they reply to any Outlook email, the font size becomes smaller. ... Alternatively, you can check your zoom settings.

You can also change the display density in the Outlook app, which will, in turn, reduce the font size. How to change the font density on the Outlook app Tap your profile icon at the top-left.

Learn how to create, change, and manage Views in Outlook by customizing the font, font style, and size of a folder by using the advanced view settings.