I can't use the offline version with a Zimbra account on the french provider free.fr.
The provider uses a customized authentication, as related in there :Zindus Blog Archive zimbra.free.fr (Zindus Blog Archive zimbra.free.fr). Quote: "free.fr is the third-largest ISP in France and is currently engaged in a 50,000-seat trial of Zimbra. The addon now supports the customized authentication required by free.fr."
Is this authentication implemented in Zimbra ?