You probably don't want to delete all fields, especially those in headers & footers. For example, if the document contains page numbering in the header/footer, every page will likely end up numbered '1' as a result. Likewise, a Table of Contents would cease to work as would hyperlinks to web pages, etc. Furthermore, unlinking all fields makes future document maintenance far more difficult.

If you want to 'harden' a document for distribution, simply save it as a PDF and distribute that.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]