It depends on what you mean.

Word 2000 does not, of itself, "support" any particular version of ADO in
the sense that AFAIK no built-in Word facilities use ADO /directly/ to do
anything, e.g. if you are thinking of setting up a mailmerge data source or
inserting a database field, Word 2000 connects via ODBC, not ADO.

If you have a version of ADO on your system that supports MD, I see no
reason why you would not be able to use those facilities in Word VBA.
However, I do not know whether a standard Word 2000 installation (or Service
Pack installation) would guarantee that a version of ADO that supported MD
would be present.