And the answer is now. I just noticed the nightly build from last night
works! ;-)
OK Microsoft, you can definitely stop sending me suggestions that I look
into the new Office 2010. Now that I've discovered Thunderbird and with
a little help from Open Office, you're nothing more than a bad memory.
There are ways around the checks. Mozilla has made it harder, recently,
but one can still get around the checks. I don't know if Lightening is
one of those which WILL work with 3.6RC1 or not, but all of mine seem to
work just fine, EXCEPT for Compact Headers 1.0, which is SUPPOSED to be
for 3.6RC1, and doesn't work.... Darn strange.