Hi Sheep,

The only way to do this automatically would be use to a macro that hooks into Word's mailmerge event. Do note, though, that a user who's macro security is set too high, or who chooses to disable the macro when opening the mailmerge main document, will defeat your intentions. You would also need to have the password hard-coded into the macro - which you'd then presumably want to password-protect to protect as well.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]