imapsync
imapsync is an IMAP transfer tool for moving or backing up mailboxes. Its command-line software transfers mailbox contents incrementally and recursively, and a transfer can be stopped and resumed without creating duplicates. It runs on Windows, Mac OS X and Linux, and listed compatible services and server software include Gmail, Office 365, Exchange, Dovecot and Zimbra. The online service provides free mailbox syncs below 3 GB; paid access allows unlimited syncs of any size. Buyers also receive a visual interface for installation on a Linux server, though that interface does not work on Windows. Staged and tenant-to-tenant migrations are supported, including Microsoft 365 and Google Workspace. The software-only plan costs 72.00 EUR per once; Imapsync + support costs 144.00 EUR per once. The tool does not migrate contacts or calendars, keep two active accounts synchronized in both directions, or transfer messages to or from a local directory.
Who it is for
It suits people moving or backing up IMAP mailboxes, including staged or tenant-to-tenant migrations. It is not suited to workflows that require contact or calendar migration or two-way synchronization between active accounts.
What is good
- Incremental, recursive mailbox transfers
- Transfers can resume without duplicates
- Supports Microsoft 365 and Google Workspace
- Free online syncs below 3 GB
- Staged and tenant-to-tenant moves supported
What to know first
- Does not migrate contacts or calendars
- No two-way sync between active accounts
- No transfers to or from local directories
- Linux-only visual interface for buyers
Verdict
imapsync covers mailbox migration and backup across a range of listed IMAP systems, with resumable transfers and a free online option below 3 GB. Check its migration limits first if you need contacts, calendars, active two-way sync or local-directory transfers.
imapsync plans and pricing
All plansCompared on email migration software
- Free plan
- Yes
- Calendar migration
- No
- Contacts migration
- No
- Tenant-to-tenant moves
- Yes
- Staged migration
- Yes
- Microsoft 365 support
- Yes
- Google Workspace support
- Yes
- IMAP support
- Yes
