View email messages by conversation
https://support.microsoft.com/article/0eeec76c-f59b-4834-98e6-05cfdfa9fb07
By default, when you add most account types to Outlook, your messages are displayed in Conversations. A conversation includes all messages in the same thread with the same subject line. From any mail folder, such as your inbox, select View > Show as Conversations to toggle Conversation view on or off. Select All mailboxes or This folder. From any email folder, such as your inbox, select View > Conversation Settings Show Messages from Other Folders Use this option to display messages in the conversation that have been moved to other folders as well as messages you've sent that are stored in your Sent Items folder. Show Senders Above the Subject Selecting this option shows the sender names at the top of the conversation rather than the conversation subject. Always Expand Selected Conversation This option applies only to the currently selected conversation. The conversation selected when you check this box will always appear expanded. Use Classic Indented View Classic indented view shows messages in the conversation indented based on their position within the conversation.
From any mail folder, such as your inbox, select View > Show as Conversations to toggle Conversation view on or off.
Select All mailboxes or This folder.
From any email folder, such as your inbox, select View > Conversation Settings
Show Messages from Other Folders Use this option to display messages in the conversation that have been moved to other folders as well as messages you've sent that are stored in your Sent Items folder.
Show Senders Above the Subject Selecting this option shows the sender names at the top of the conversation rather than the conversation subject.
Always Expand Selected Conversation This option applies only to the currently selected conversation. The conversation selected when you check this box will always appear expanded.
Use Classic Indented View Classic indented view shows messages in the conversation indented based on their position within the conversation.
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