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In classic Outlook, select a message to mark as read and press Ctrl+Q, or on the Home tab, select
 Unread/Read. -
Select a message to mark as unread and press Ctrl+U, or on the Home tab, select
 Unread/Read. If you don't see Unread/Read, select Tags or the ellipsis ( ) on the Home tab first.
Tips:Â
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To set the mark as read time with the Preview Pane, see Use and configure the Reading Pane.
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To change read or unread message colors and fonts, see Automatically change incoming message colors and fonts.
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In new Outlook, in the message list, Ctrl+click to select an item or items.Â
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On the Home tab, selectÂ
 Read / Unread.If you don't see Read / Unread, select  More options on the right end of the Home tab first.