Please pardon me for not being sufficiently serious and righteously
respectful. Here are the answers to my question: (1) Visio 2003 and Visio
2007 support UML 1.3; (2) There are a number of third party add-in templates
and stencils available for Visio 2003 that at least provide UML 2.0 shapes;
(3) There are no plans at least in the near term to update Visio to support
UML 2.0 or higher. Thanks for your help.