I've got a trouble with a zimbra server that I've just install, trouble that I never met on the different servers that I install those last years on different version of Zimbra (love it ) : the mail polling from an external account is not working automatically, the user has to click on the "refresh" button to see if there's new mails or not.

I've search on forums, find different posts talking about the datasource polling intervall, so had the command "zmprov mds jdoe@holo.net xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx zimbraDataSourcePollingInterval 120s" for the differents accounts, but it didn't change anything

Should somebody help me please ?

Zimbra version : zcs-7.2.0_GA_2669.UBUNTU10_64.20120410002303.tgz
Server OS : Ubuntu 10.04.4 LTS (lucid)