Hi, We are using Plesk 6.5.1. Some users have reported problems using the "Mail Groups" feature. It seems that when they try to add more than 5 email addresses to a group, an error message similar to the one below is returned : Unable to list files, unexpected error. When we click "OK", another bunch of error messages display : MailManager encounter an error: mailmng failed: Unexpected error 0: D:\PROGRA~1\SWsoft\Plesk\admin\plib\class.MailManager.php:52 psaerror(string "MailManager encounter an error: mailmng failed: Unexpected error") 1: D:\PROGRA~1\SWsoft\Plesk\admin\plib\cmd_mail.php3:1592 mailmanagermaker() 2: D:\Program Files\SWsoft\Plesk\admin\htdocs\domains\mail\mn_edit.php3:338 rm_mbox_quota(integer "171", string "ca", string "tdscom.com") I am not sure if this is related to the number of email addresses contained in a group, or related to the total combined length of all the email addresses contained in the group. Has anyone had the same problem? Thanks.