This is an option in Outlook 2013. Quick way to check if email is spam or worse.
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The link target is already shown in the status line, when you hover with the mouse over the link - is that not enough?
@glassman,
Are you referring to Tooltip?https://en.wikipedia.org/wiki/TooltipIn case you're wondering, Thunderbird displays the link information in the "Status Bar".
never-displayed