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Used this around 5 years ago to migrate a mid-sized mailserver, absolutely magnificient.

I remember that back then you had to pay for the binaries, but could download the source code for free - you just had to figure out how to compile it.

The page mentions Perl source code though, so I'm not sure if I'm mixing this up with another tool...

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I think the author packages an all-dependencies-included executable for windows that you're given access when you pay for support and all that, but it's in fact perl.

I remember using this program a bunch of times during the years (and I think I've paid at least once) and remember using CPAN when configuring it.

It has helped me a bunch of times!

Same except for like 15 years ago lol. Migrated 50,000+ local imap users into a cloud mail service. Used incrementals to do most of the work in the weeks leading up then a final sync per batch of 10k users. Worked like a champ.

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