remove/increase imap-quota

[Henning]

Hi,

I would like to alter or remove the imap-quota for my kolab users. I 
removed any quota-related options from imapd.conf, increased the 
default_quota in kolab.conf and removed the quota manually by issuing 
"sq user/user_mailbox at domain none". However, the quota is always set 
again to the same default value after some time.

How to make this persistent?

regards,
Henning