This works fine for our employees using MSXML 3.x.  But my boss's boss has
MSXML 4.0.  I learned from an expert on another list that MSMXL 4 doesn't
support "Microsoft.XMLDOM" but instead requires "MSXML2.DOMDocument.4.0."
However, the latter generates an error for anyone using MSXML 3.x!

There are a number of code snippets out there which
"auto-detect" the environment and adapt. You could
start with creating a MSXML2.DOMDocument.4.0 object and
fall back to other means if you got an error.
Use google to find the examples and tutorials.