packages are upgraded and there is a major difference between sme 6.0 ( based on redhat 7 or

and sme 7.x based on cent os
.
i m using contrib add ons like squid properties and ip block internet, antivirus, qmail que management, and system monitor.
is it possible to restore only user accounts ????? i think so some addons wont work with sme 7 and some are built in like antivirus and spamassian..
if there is any expert please clear our doubts and give a chance to use sme7.. and also tip to use which version bec 7 is beta