View email messages by conversation in Outlook - Microsoft …
https://support.microsoft.com/en-us/office/view-email-messages-by-conversation-in-outlook-0eeec76c-f59b-4834-98e6-05cfdfa9fb07
WebAt the top of the page, select Settings > Mail > Layout. Under Message organization, choose either of the options depending on whether you want to show email grouped by conversation or as individual message. If you select Show email grouped by conversation, under Arrange the reading pane, select either of the options: Newest on top or Newest on ...
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