You can use the nightly version of lightning:
http://ftp.mozilla.org/pub/mozilla.org/calendar/lightning/nightly/2009/12/2009-12-09-03-comm-1.9.1/win32-xpi/
You can use the nightly version of lightning:
http:// ftp.mozilla. org/pub/ mozilla. org/calendar/ lightning/ nightly/ 2009/12/ 2009-12- 09-03-comm- 1.9.1/win32- xpi/