PG,
"IE" is just the browser. It has nothing to do how the web site works.
How good searching a web site works is 100% dependent on how the
developers and operators of that web site make it work. Discuss this
with those people.
Re Google not meeting your needs .. then don't use it. Many others find
it more than good enough. I continue to be amazed that the Google people
were able to develop such a sophisticated internet application within a
browser. Amazing.
Re Thunderbird. I don't have the Windows version of Thunderbird handy
at the moment to look for the specific commands to setup a connection to
a newsgroup server. I'm sure this is discussed in Help and I just used
Google to search for "thunderbird newsgroup" and found
http://csg.trinhall.cam.ac.uk/tips/news/tbird on the first page.
To be notified of replies to you posts, you need to find a web service
that provides that service. AFAIK, Google's service does not do that.
Thunderbird will surely not do it, but it has other ways to indicate to
you when it detects threads/postings related to you.
Read about how to use Thunderbird in the available documentation.
--rms
www.rmschneider.com