Single click to open a mail file

One of my users asks that to open a mail by single clicking on it. Could not find a way of doing it. Can any one confirm this. Thanks.

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Subject: Single click to open a mail file

You can open the mail-file by single-clicking on the mail bookmark.

If you mean single-clicking on a mail-message then you could open the preview pane. That will allow you to see the message with a single click.