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In outlook web app there is an option called "Set default From address". This is missing from the Outlook desktop app. Please implement this in the app. This option should be configured per email account. Without this option is a pain to use your own email address (I mean your own address with your own domain name, which feature was provided with Office 365 Home, Premium feature). Outlook.com has this feature, the android app has this feature, but the paid Outlook desktop not.