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I have an IMAP E-Mail account with my old provider.

I have a new, empty IMAP account with the new provider.

Is there a tool or Thunderbird to migrate the E-Mail data from one account to another? I'm a bit wary about just doing a drag & drop in Thunderbird because it's quite a lot of data, and I have a deep distrust against how Thunderbird deals with IMAP data.

I'm working on Windows 7, so I would prefer a graphical Windows tool. If need be, I can work from a Linux box as well.

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5 Answers 5

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Be carefull when draging and dropping IMAP to check the contents of any subfolders. Different flavours of IMAP handle subfolders differently and with some thuderbird will transfer the folder but not its contents. I've found the best mail client for draging to/from Courier IMAP accounts to be Mulberry. - Its a bit retro but does the job.

If you end up using a syncing tool, you run the risk of ending up with duplicates. In that case there is a Thunderbird plugin that will remove them for you but it can gag on large inboxes.

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Try using imapsync, available also as a standalone imapsync.exe. Free, open but not gratis from the homepage.

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Cheers sntg, but I'm on Windows with this. Sorry, should have mentioned it - adding it now. – Pekka 웃 Apr 1 '10 at 21:54
Imapsync is great - well worth spinning up a linux box if you can. – EEAA Apr 2 '10 at 2:36
imapsync is written in Perl. Should run run in Windows as well. – Dan Andreatta Apr 2 '10 at 7:17
Not free at 50 euros. – PaparazzoKid Apr 9 at 8:23

I'd recommend the drag and drop, but do it in manageable chunks, e.g. 1 month at a time. You could also copy down to a local directory first, then up to the new server.

Good luck,


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Like sntg, I'd try using imapsync first (should also run under Windows with ActivePerl).

If you can't get it to run, try imapsize which can - besides a lot of other things - migrate your mails between two IMAP accounts.

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From recent experience migrating imap accounts using imapsize, it changes the dates on all the migrated emails to the migration date. If anyone know's how to get it to keep the original date please let me know. – Rich Aug 19 '12 at 14:52

We used Hexamail POP3 Downloader to synchronize our IMAP accounts during our server move. It runs on any version of Windows and has a GUI to help you configure it. You need to add the IMAP Push module to push email back up to IMAP Accounts.

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