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Since upgrading to 6.0.7 (now running 6.0.7.1 FOSS) I have noticed the antivirus not starting properly on my server.
See screenshot from console as server boots. Note: admin screen visible in screenshot displayed after that AV is not running.
Shutdown Zimbra and see if there's any zimbra processes still running, if there is then kill them and restart Zimbra. If there aren't any processes running then just restart Zimbra and see what errors there are in the log files.