Rated 3 out of 5 stars
Actually a very good plugin, but since upgrading my Owncloud-server to 6.0.0 Thunderbird (24.2.0) will freeze after about 30 seconds after startup, if an Owncloud-CalDav-calendar is used.
Thunderbird does not react any more and must be killed. Owncloud 6.0.0 ist not usable with Lightning (2.6.4).
The problem occurs on all my systems (Ubuntu and Windows 7 64 Bit).
I tested the versions down to 2.6.0.