To have all email messages sent to a single inbox in Webmail/Outlook rather than being presorted into a Focused and Other tab, please complete the following steps (diagram at bottom).
1. Click the gear icon at the top right of the Outlook interface to open up Settings.
2. Select the Mail tab.
3. Select the Layout subtab.
4. Select Don't sort my messages.
All of your email messages should now appear in the universal inbox.