On Mon, 2005-10-10 at 16:08 +0200, Arnaud Limbourg wrote:

Hello,

I was previously running a cyrus server which I realized later on is overkill for what my needs so I would like to switch to dovecot.

Unfortunately the cyrus2courier utility to migrate the mails gives me the error Header version 6 not supported

I was using cyrus 2.2.3.

Does anybody have any advice on how I could migrate all the mails ?

Run both servers at the same time and copy all the mails via some IMAP copying tool. I don't remember what tools exactly exist, but probably google helps with some "imap to imap server copy" keywords.

Or you could try talking to original author of the cyrus2courier if he'd be willing to fix this.