You can't use formfields in a mailmerge document - they get deleted when the merge executes. However, you could insert all your mergefields into Rich Text Content Controls. That way, without the need to IF tests, the Content Controls will display either the merge results or the standard Content Control prompt. Plus the users will be able to edit any data that needs updating. When the forms are returned, you could then programmatically capture the data from the content controls to update the data source.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]