For installing fonts in Windows 10, it's best to head for the Control Panel (Start Menu > Windows System > Control Panel) and look for Appearance and Personalization. The fonts section is in there.

Most Microsoft apps use the same font by default. However, if you want to always use a different font in one or all of your desktop 365 apps, you can change the default manually.

QUICK ANSWER To change the default font in Outlook on Windows, head to Settings > Mail > Compose and reply, then select your default font and size under Message format.

Microsoft PowerPoint is a popular platform made for presentations. Learn how to set shape colors and text box font as default in PowerPoint.