You could use Thunderbird, but it’s slow for large mailboxes and multiple accounts. Being cloud-based, Migrate Wizard moves email faster, tracks progress, retries on errors, and supports incremental syncs - all without running a client locally.
> does it matter how long it takes if you're going to do it once?
I do it regularly for backups and updates. For an update I basically spin up a new server and then sync it. I do not want to wait that long, to see whether an update contained a bug or not.
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