No - otherwise you'd have encountered one before now. Besides which, it seems you still haven't grasped the idea that a log file would likely only show the same set of records as appear in the merged output. If that's all you want, you could run a simple directory merge using the same query parameters and just the mergefields you want to appear in the log. It's up to you how much reliance you'll place on such a log when it will invariably return the same (in)correct results as the merge you're trying to log.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]