Review for .vcs Support by ck-in
Rated 4 out of 5 stars
Works fine with my environment (Windows x64) and import of *.vcs files. Maybe not too intuitive to use, as you have to search for Thunderbird Menu -> Events and Tasks -> Import... and switch the file filter in the pop up window to import a *.vcs file.
To create your own collections, you must have a Mozilla Add-ons account.