Hi all, I sometimes check mailbox storage to see user logon, logoff time; but today all the users logon are NT AUTHORITY/SYSTEM ! (although the users already send/receive mail ) Is that server fail ? How can I do ? We're using Ex2K SP3 on W2K SP3. Thanks ! Ngoc Dinh Xuan Network Admin www.huesp.com.vn <http://www.huesp.com.vn/>