This week I released a new version 3.2.x
It has some big changes to the internal processing of calendar messages. This change will also be applied to tasks when I have time.
It can now also do Autodiscovery using the SOAP interface. The previous versions used the older POX interface but Microsoft is only introducing new autodiscovery features into the SOAP interface. When you are still using an old exchange server the add-on will fallback to using POX.
Please test it.