Hi Brian, welcome to Vista Forums.
Sorry, but there is no such option like this available in Windows Mail. The Closest thing would be
Windows Calendar included in Vista. There should be a toolbar button icon for it by default on the toolbar in Windows Mail to open it. If not, you can right click on the toolbar in Windows Mail and click on Customize, then add the Windows Calendar icon button.
If you have Office 2003, you can install it on Vista also to run either it or both it and Windows Mail. With Vista, you can use the 2003 and newer versions of Office.
Hope this helps,
Shawn