If you log in to Outlook on the Web (OWA) to access your LSUA email, you may have noticed your inbox is split into two tabs - Focused and Other. 

Microsoft filters what they think are your most important emails on the Focused tab while the rest remain on the Other tab. 

However, you can disable this feature. 

1. To disable, click the settings icon in the upper right. 

2. Look for "Focused Inbox" and toggle the setting off.