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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.

Migrate Wizard is a fast, secure IMAP email migration service that helps developers and teams move email data between providers with zero downtime.

It supports large mailboxes, preserves full data integrity, requires no setup, and works with any IMAP-compatible email service.