A very nice feature offered by Barracuda Networks Spam Firewall is the Thunderbird plugin to classify mails as spam within Thunderbird. But after upgrading Thunderbird to 2.0.0.4, the plugin stops working. Barracuda Networks Support answer to this : Unfortunately we do not have a new version of the Thunderbird plugin and we currently do not have an ETA on when a new plugin will be available. I apologize for this inconvenience.
One solution might be to build as custom Thunderbird filter, mentioned here.

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