I recently inherited a client, that is running Windows small business server 2003 standard. They have a file on the server that they are giving modify rights to three users. Every time those rights are given to those users, everything works perfectly fine for 2 to 3 days, then two of the users disappear and the remaining user rights change from modified to read only. I have enabled audit logs for that particular file to try to determine what's changing the permissions, but no indicators there. Any ideas on how to resolve this? The file is a production critical object and they need access to this everyday.