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How Do You Change Email Aliases in Windows 10 Mail App
If you have more than one email alias in Outlook.com, with the Windows 8 Mail app you could choose what alias you wanted to send an email from by clicking on 'More' and selecting the address you wanted to use from the drop-down list.
You could also set which email alias to use as the 'Preferred Email Address' (I.E. Default 'From' email address).
How do you do this in the Windows 10 Mail App?