[Dovecot] Folder name migration when moving from 2.0.x to 2.1.x?

[Timo Sirainen]

On 18.2.2012, at 19.18, Ralf Hildebrandt wrote:

> Today I encountered this after upgrading:
> 
> Feb 18 18:15:40 postamt dovecot: imap(lehnertr): Panic: LIST: Mailbox name not UTF-8: INBOX.Entw�rfe
..
> a) It should not PANIC (I think)

Right.

> b) How can I globally "fix" the folder names (preferably in such a way
>   that I am able to switch back and forth between 2.0 and 2.1)

What does this look in filesystem? Is it not in mUTF-7? If the problem is in filesystem, rename it to mUTF7 (you can use doveadm mailbox mutf7)