The merge to email process actually executes two mailmerges - a Catalogue/Directory one from whatever data source you're using and an 'normal' one from the macro-reworked table created by the first one. So, yes, it actually uses two mailmerge main documents. The reason for doing it this way is that it can be made to work with any data source Word can use for mailmerges. The Addins I referred to only word with Excel data sources. The approach I've taken is perhaps also easier to implement (once you get your head around it!!).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]