I am a single user mainly of the creative suite but also Live Cycle and Acrobat Pro.
There are various 3rd party email mail merge programs (like PDF Machine Merge) but which, if any, Adobe product manages this process?
There's a built-in command in some versions of the PDFMaker plugin for Office that can do it, but only with Acrobat forms, not LiveCycle.
I think there is an Outlook add-in that is installed with Acrobat that will do this, but the only way it can be done directly with Acrobat is with a custom script (which can be pretty easy depending on the data source) or a third party add-in. I have a script for this very thing, and a video tutorial at www.pdfscripting.com . It is however more of a learning thing than a finished product.