Veronica hit the nail on the head... using EasyMerge for anything other than one-off database merging doesn't make any sense. In my time as a Marketo enterprise consultant, I had many clients have great success with some of the launchpoint partners that provide the on-demand services that you seem to be looking for. Personally, I have had great experiences with RingLead. I did have a client that used Marketo's EasyMerge on a bi-annual basis. For their purposes, they could justify the annual cost, and it performed the function they were looking for. Their goal was to keep their duplicates at less than 2% of their database, but were on a very aggressive acquisition calendar, so about every 3 months they seemed to have another giant batch of names come into their system, so the regular easymerges made it possible.
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