[Dovecot] Filter from Outlook fails after migration

[Antonio Perez-Aranda]

We have some users which use Outlook 2003. After migration de Maildir
from Courier to Dovecot, this user have some errors on their accounts
because Outlook filters don't run.

Some of this folders name contain chars like '-' but another folder
with only letters fails too.

Then ¿Does any people have similar errors with Outlook 2003?

Dovecot version 1.2.15