imap-migrate vs Shoviv Email Migration Tools

imap-migrate is a free, open-source command-line tool for transferring the contents of one email folder between IMAP hosts. It can work with providers that support IMAP, including Gmail, Outlook, Fastmail, Yahoo and custom servers. The tool preserves original received dates and flags such as Seen and Flagged, and shows progress, transfer speed, success and error counts, plus estimated time remaining. It records actions in migration.log. Its README says interrupted migrations can be rerun without duplicating emails; the --dry-run option checks connection and settings without moving messages. Credentials can be supplied as command-line arguments or environment variables, with environment variables recommended by the README as the more secure option. Both accounts need IMAP access enabled, and the tool requires Python 3.12 or higher; uv is recommended for dependency management. It runs on Linux, macOS and Windows and is licensed under MIT. It does not rebuild a full folder structure or migrate provider-specific features such as Gmail labels or categories. Bug reports and contributions are invited through GitHub issues and pull requests.

Shoviv Email Migration Tools is Windows software for moving Exchange mailboxes between on-premises Exchange and Microsoft 365. It supports all versions of on-premises Exchange and Microsoft 365 as sources and targets, including Microsoft 365 tenant-to-tenant migration. Multiple mailboxes can be processed, with no stated restriction on mailbox size or mailbox count. The tool migrates shared, public-folder, and archive mailboxes. Incremental export can resume an interrupted job and carry new or changed items on a later run. Filters can target dates, folders, or item types, and jobs can run daily, weekly, or monthly. Shoviv describes standalone installation in the customer environment, with no third-party tools or cloud services used for migration and no source-data modification. Windows and Windows Server are supported, with Windows 10 or 11 recommended and 32-bit and 64-bit architectures listed. A free trial processes or saves the first 50 items per folder. Paid pricing starts at $39; listed lifetime mailbox plans include $494.90, paid once for 10–150 mailboxes, $8,984.49, paid once for 200, $13,963.49, paid once for 400, and $14,952.99, paid once for 500.