First (and successful) tests of jCal, the JSON format for iCalendar, tested for at least three servers

CalDAV Managed Attachments, tested by multiple clients and servers

Timezones By Reference (including servers/clients behavior if timezone data not sent, and CalDAV extensions to advertise Timezones by Reference (e.g. Timezone Service Protocol enabled)

Initial testing of Prefer Header, a new specification allowing a WebDAV client to request certain behaviors be implemented by a server while constructing a response to a successful request

VPOLL support on servers and interaction with existing clients

Testing new VTODO properties/values defined by CalConnect TC-TASKS to verify they are supported by servers and clients

In-depth review of the CalDAV Tester Suite and how to implement and use it