[Dovecot] Broken foldernames in mbox

I have a mbox-User with some crazy foldernames:

-rw------- 1 vmail vmail 19238931 17. Dez 2011 Foo & Co -rw------- 1 vmail vmail 82415 19. Nov 22:06 Foo &- Co

Dovecot can't handle that correctly:

# dovecot mailbox list -u user Foo & Co Foo & Co

dsyncing those folders produces some errors:

dsync(awad): Error: Mailboxes don't have unique GUIDs: 228d0731cb186750e9150000a69b85fa is shared by Foo & Co and Foo & Co

Peer

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