When the Customize dialog box is open, he must make sure that "Save in"
(bottom of dialog box) is set to the template into which he wants to save the
changes (in his case, it may be Normal.dot).
In order for the changes to remain, the template in question must be saved.
He can save the changes at once: Press and hold the Shift key while you
select File > Save All. If the changes were made to Normal.dot and if a
dialog box opens, asking whether to save changes to Normal.dot, click Yes.
For more information, see:
http://www.word.mvps.org/FAQs/Customization/AsgnCmdOrMacroToToolbar.htm
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Regards
Lene Fredborg
DocTools - Denmark
www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word