Will stencils and templates created in Visio 2007 work in Visio 2003?
Yes and no, they will work but use of any new features from Visio 2007
will be lost within Visio 2003. Certain macros may not work in 2003
and shapes/templates that use an addon from Visio 2007 may not work
with the Visio 2003 version of that addon.