Content controls are not compatible with Word versions prior to 2007. In versions earlier than that, they are converted to their results.

As for the checkboxes, I'm not suggesting a change in the document design - just in the way the checkboxes are checked/unchecked. Be that as it may, if you can't use content controls it's a moot point.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]