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Zimbra has some cool graphs to show to suits, but they are only updated once per day, so you can see the previous day's stats, but they are not current right now. To update the statistics graphs manually, just log in to the zimbra server with ssh and su to the zimbra user

sudo su
su - zimbra
/opt/zimbra/libexec/zmgengraphs

This will kick off the graph generation process. When its done, refresh the admin console and show off your new, up-to-date graphs.