How to track when did the quota changed in zimbra server?

This is using zimbra collaboration suite 6.0.8. Suddenly, we found that few of the mailbox quotas changed from 100Mb to 1GB, etc. Where can I track when did these changes made? If possible, by who?
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Yes!, it's possible:

Check /opt/zimbra/log/audit.log

For example:

* If quota has changed via webmail interface:

2011-04-19 14:59:34,037 INFO  [btpool0-1228://lisa:7071/service/admin/soap/ModifyAccountRequest] [;mid=1;ip=X.X.X.X;ua=ZimbraWebClient - FF3.0 (Linux);] security - cmd=ModifyAccount;; zimbraMailQuota=9437184000; ........

* If quota has changed via zmprov command:

2011-04-19 15:01:34,383 INFO  [btpool0-1227://localhost:7071/service/admin/soap/ModifyAccountRequest] [name=zimbra;ip=;ua=zmprov/7.0.0_GA_3077;] security - cmd=ModifyAccount; zimbraMailQuota=10437184000;

Filter the file. For example:

grep ModifyAccount /opt/zimbra/log/audit.log | grep zimbraMailQuota

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Excellence, it solved my problem
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