I got a new laptop at work recently and after clicking an email address on a web page I was prompted to select a default app; unfortunately, I mis-clicked and selected the Mail app instead of Outlook. You can change a default app via the Settings » Apps by selecting Default apps:
Find the app you want to change the default for and click the entry; in my case the URL:mailto entry:
In the popup, select the app you want to use and click OK{/b]:
In the Default Apps you will see the new assignment displayed:
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