Extend Calender Synchronization

The gnome clock displays a calender with events and this is linked to Evolution . The calender can be synchronized with calender services like that of Google .

But the problem is that many users are using Thunderbird . In this setting the calender synchronization is not possible .

So
1 . Support synchonization with common email clients , at least Thunderbird or
2 . Implement separate feature to handle calender and on-line synchronization .

Methode 1 may be implemented by separate plug-ins .