Email quotas after mailbox conversion

hello, we converted some of our servers to mdbox and it seems that the old emails are also compressed. But, now we have a problem with the quotas. ALL the users used quota are to 0 ... I did a try with the /usr/local/cpanel/scripts/fixquotas script, but the used quota are still 0. What can i do to make that the used quotas are listed correctly ? Thanks Regards