This is more of a Mozilla Thunderbird issue but I think Ubuntu should push more for better calendering integration using the SDK provide by MS .
http://msdn2.microsoft.com/en-us/library/ms988691%28EXCHG.65%29.aspx
Calendaring
Microsoft® Exchange Server 2003 includes rich calendaring features that you can use to build calendaring applications. Collaboration Data Objects (CDO) provides the logic necessary to create applications that incorporate appointments, meetings, messages, and other calendaring items. The topics in this section describe how to use CDO to develop custom calendaring solutions.
//Creating an Appointment with CDOEx
#import rename_namespace("CDO") raw_interfaces_only
#include
#include
enum ConnectModeEnum
adModeUnknown = 0,
adModeRead = 1,
adModeWrite = 2,
adModeReadWrite = 3,
adModeShareDenyRead = 4,
adModeShareDenyWrite = 8,
adModeShareExclusive = 12,
[....]
