Ordinarily there are no fields in a mailmerge output document - the fields that were in the mailmerge main document will have all been converted to the text of their results when the merge was executed.

I suggest you apply a unique Style name to the mergefield whose results you want to appear in the footer, then use a STYLEREF field in the footer to reference that Style. No VBA required.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]