[CentOS] thunderbird-24.2.0-2.el5 is borked

Leon Fauster writes in "RHEL 7 Beta is now public":
> RHEL7 without thunderbird :-(

 Speaking of which, the tb-24 update in 5.10 is totally broken. Cannot get
 lightning calendar to work all, even after starting with a fresh setup.

 There are two calendar toolbars, the New Calendar iitem and nearly everything
 else in this menu are grayed out, and the Day/Week/Multiweek/Month tabs don't
 work.

 tb-24+lightning 2.6.4 certainly work fine on my machine at home (not CentOS).