From the drop-down menu, select “All Mailboxes.”.
For that reason, we’ll show you the way to view mail from all Outlook accounts at once. If you use Outlook for multiple email accounts, searching through each separately can be a time-consuming task. However, in terms of the Outlook email client and its functionality, both are the same. There are other differences, too, one being that Outlook 2019 requires users to purchase the upgrade, while Office 365 users receive them for free. As we mentioned, MS Outlook 2019 and Office 365 Outlook have certain differences pertaining to how they are purchased.