[Athen] Accessibility of Lightning calendar plug-in (for Thunderbird)?

[Todd Schwanke]

Hi ATHEN:

Is anyone aware of an accessibility evaluation that has been done for the Lightning calendar plug-in for Mozilla Thunderbird or have any experience related to its accessibility?

Alternatively, does anyone:
* Have experience with the accessibility of any other CalDav (http://en.wikipedia.org/wiki/Caldav) compatible locally installed calendar clients? (particularly ones that work well)

* Have experience with the accessibility of any other CalDav compatible web-based calendar clients? (again, particularly ones that work well)

Thanks,
Todd
UW-Madison