Out of ideas - migrating from 3.0

Trying for the Nth. time to upgrade from 3.0.18 to newer (3.2.12=20
currently) version using sync, the plan is to increment upgrade to 3.4=20
and so on.

It is a very standard setup, no murder etc., around 500GB mailstore,=20
100+ accounts..

Switched from Xapian to Squatter
Disabled and removed conversations (-z)
Restarted imapd

Replication runs fine for about 2/3 of the accounts, then bails out.

Ran all sorts of reconstruct on the specific mailbox, checked telemetry=20
etc etc nothing helps.

Debugging Cyrus IMAP is not exactly a walk in the park, how can I find=20
what is wrong with this specific account?

sync_client -vv  -l dumps a LOT of info but where in there do I see the=20
problem?

Thanks,

Per

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