I have an IMAP (Cyrus) mailbox I am trying to test migration with, which has 20,000+ messages. When I run the migration it goes to syncing for a few minutes and then reports that it completed successfully, sends me the email to that effect, but only 703 or so messages (it varies) are migrated. I see this when I look at the online mail app, and using the Mail app on a mac.
There appears no way to force it to run another migration, and I read that it takes 24 hours before it will try again, so I delete the migration, create a new one, and then it will get another few 100 messages or so.
I expected it to run for a long time but sync 20,000+ messages.
I am running with mostly defaults - e.g. default retention policies etc - which might influence things.
Any ideas? and thanks