To change the default email app on an iPhone, you'll need to upgrade to iOS 14 and make sure you have a compatible app ...
To change the font in Outlook, head to the "Signatures and Stationery" menu, where you can pick from a number of fonts.
To change the default browser in Outlook 365, go to File > Options > Advanced, then scroll to “Link Handling” and set “Open hyperlinks from Outlook in” to your preferred browser, like Chrome.
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