Hi there,
This group seems to have gone quiet, but worth a shot anyway, especially since Larch seems like exactly the tool I was looking for and will hopefully save hours of click-and-drag tedium.
After a couple of successful test runs on smaller folders, I set it loose on my inbox. The next day it had successfully copied about 16,000 message, but reported about 400 fails, so I ran it again to see if it could pick up the failed messages on the second pass, but no luck. I keep getting the error "Net::IMPA::BadResponseError: Invalid UID Fetch attribute" - can anyone tell me what this means or how to fix it?