Turning unread flags off and on
When a message is unread, a red flag is displayed beside it. You will also see a red flag beside the icon for your Mailbox or a conference that contains unread messages, plus the number of unread messages that are inside.
After you open an unread message, the red flag beside the message disappears. If you want this message to attract your attention again, you can put the flag back. To do this, choose Message > Mark as Unread with the message selected. To remove the flag again, choose Message > Mark as Read.
 ShortcutControl-click (Windows, Linux) or Option-click (Mac) beside the message in the flag column.
If you select a block of mixed read and unread messages, then choose Message > Mark as Read, only the unread messages are affected; their flags are removed.
Removing all unread flags
To remove all unread flags in a container, select the container's icon, then choose Message > Mark as Read.
Shortcut
Control-click (Windows, Linux) or Option-click (Mac) the flag beside the icon.
If you choose Message > Mark as Unread while this icon is still selected, all messages in a conference, or all messages sent to you in your Mailbox, are marked as unread, not just the ones that were originally unread.
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