The online version is handy for a one-off transfer and keeps going after you close the browser. The Windows client uses your own machine and does not eat into the cloud limit.
Cloud
Transfer online
Nothing to install. Connect the two mailboxes, run a size check and leave the job to our server.
One full mailbox up to 5 GB free
No MoveMailbox account, no sign-up
The migration keeps running after you close the tab
A single docker compose up and the web interface comes up on your side. Mail goes through your own server, with no MoveMailbox infrastructure involved.
No limits on size or number of mailboxes
SQLite history with no plaintext passwords
Passwords go to the imapsync process and are not stored
The desktop client is free and is not bound by the 5 GB cloud limit. It copies straight between your servers, bypassing our infrastructure.
No charge for size or message count
Mail traffic goes through your own computer
Dry run that copies nothing
Live progress, cancel and a log
Local mode — the window has to stay open. Copying runs from your computer, so closing the client or letting the machine go to sleep will interrupt the transfer. An interrupted transfer is not lost: run it again and it copies whatever is still missing.