How to update ClamAV in Zimbra MailServer

Download ClamAV
http://www.clamav.net/download
clamav-0.99.2.tar.gz

#yum install gcc

#mv /root/clamav-0.99.2.tar.gz /opt/zimbra/.
#cd /opt/zimbra
# tar -xvf clamav-0.99.2.tar.gz
#cd /opt/zimbra/clamav-0.99.2

#./configure --prefix=/opt/zimbra/clamav-0.99.2 --with-user=zimbra --with-group=zimbra

# make check
# make install
#rm -rf clamav
#ln -s clamav-0.99.2 clamav
#mkdir /opt/zimbra/clamav-0.99.2/db
#chown -R zimbra:zimbra /opt/zimbra/clamav-0.99.2
#su - zimbra
$ zmcontrol restart
$ zmprov ms `zmhostname` +zimbraServiceEnabled antivirus
$ zmcontrol restart

#zmcontrol status

Ref URL
https://wiki.zimbra.com/wiki/ClamAV_DB_update_leads_to_**UNCHECKED**_in_all_messages
http://www.onaxer.com/2011/01/04/zimbra-clamd-issuesantivirus-out-of-datefailed-to-start/