Tags: messages view, classic view, outlook, webmail, OWA
When you’re using any Outlook app or Webmail, the default view is the Conversation View, sorted by the date. When you turn conversation on all messages with the same subject appear as conversation.
On the View tab, in the Messages group, click Conversation Settings.
Note: The Show as Conversations check box must be selected to enable the Conversation Settings command.
Click the option that you want.