If you're a group owner, you can delete group conversations, or individual group messages, in Outlook.
Note: You must be a group owner to delete a group conversation.
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Open Outlook for Windows.
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In the navigation pane, under Groups, select your group.
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Right-click the conversation or message you want to delete and select Delete.
Note: If the instructions don't match what you see, you might be using an older version of Outlook on the web. Try the Instructions for classic Outlook on the web.
Note: You must be a group owner to delete a group message.
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In the navigation pane, under Groups, select your group.
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In the message list, select the conversation you want to delete.
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On the command bar, select Delete.
Instructions for classic Outlook on the web
Note: You must be a group owner to delete a group conversation.
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In the navigation pane, under Groups, select your group.
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In the message list, select the conversation you want to delete.
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At the top of the message pane, select > Delete conversation.