During the Q&A section of tonight's meeting, someone asked what the differences were between the Mail program that comes with the latest version of the Mac operating system (10.8, Mountain Lion) and earlier versions. We went to Mail's "Help" menu and chose "What's New in Mail?"
One of the new features discussed was how to make a sender a VIP and it contained a clickable link
The gratification came when I got home and fired up Mail. Lo, there was a new "VIPs" mailbox in my sidebar, with a sub-folder for Holly within it, and all previous messages from her moved into it.