>>>We are having a hard time determining exactly when this atarted happening, but if we try to do a mail merge it will give this error. Does not happen on the development boxes with different EXEs or datasets, but it does happen on one client's PC and in our testing environment, from different boxes. I've been doing some searching, but nothing really sounds like what we have. Anyone have any ideas of what to look at? The hardest thing is that it does not occur for the developers, but the same exe and dataset will have a problem in test and at the client site. This also happens if you try to a manual mail merge from Word accessing a Foxpro table. But, it does not happen for development boxes.
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>>What error are you getting?
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>Actually my title has been mucked-up in this post. It should say: Word "unable to find data source" in new build
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>But something trashed it.

I think the quotation marks are the problem (you should have got an error message (a cryptic one).
I find that single quote (apostrophe) gets through OK.