Outlook: Turn off Conversations
By default Outlook displays your messages grouped by conversation. These instructions are for the Web App. To turn this off in the Outlook desktop application, simply uncheck the box next to "Conversations" on the Home tab of the ribbon.
First determine whether you are using the new Outlook or the old Outlook:
If you are on the new version of Outlook
Click the GEAR icon in the upper right corner and then click on View All Outlook settings at the bottom of the screen
Outlook Settings for new web app
If you are on the old version of Outlook
Click the FILTER drop-down to find the settings for conversations:
Outlook view settings - old web app
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