You can change your Outlook theme in your account settings while logged in through a browser or in the Mac and Windows apps.

To change the font in Outlook, head to the "Signatures and Stationery" menu, where you can pick from a number of fonts.

Microsoft Outlook is a personal information manager for emails, calendars, and contacts. Outlook emails may contain crucial information, such as meeting schedules and contacts, so it is wise to back ...