FWIW, the nature of newsgroups is that once they are started they can't really be removed.
No real need to REMOVE groups, why not add new ones.
So the newly added groups have some permanence, rather than call them
microsoft.public.office.2007.beta, miscrosoft.public.word.2007.beta
you could just call them
microsoft.public.office.2007, microsoft.public.word.2007
so it would be useful well into the future past the release.
These groups would complement existing groups which should still stay
up.
From Google groups to the 'forums' on various websites that put their own name on the
Microsoft newsgroups hosted on news://msnews.microsoft.com there are a lot of
'copies' out there and turning off a group name on microsoft.com doesn't remove it from the others.
As far as I'm concerned the term or word "Newsgroup" refers to a
Usenet Newsgroup which are hosted on a Usenet News Server and can be
accessed with a Usenet Newsreader.
Many Usenet Servers all over the planet sync (very quickly). How all
the Usenet Servers sync is too technical for me.
I DO know that the administrator of a News Server can decide what
groups to host and what groups not to host, and has control over
retention - (how long messages stay on the server before they roll off
because of disk space).
Microsoft carries 2,275 Usenet Newsgroups on the Usenet News Server
msnews.microsoft.com, not counting beta and other private news groups
I have no way of knowing about.
But because of who they are, and the fact that they keep their server
public (at last the 2,275) a few more groups specific to Office 2007
isn't going to be a big deal.
Also, because of who they are, I know that almost every single one of
the public Microsoft Newsgroups on their server msnews.microsoft.com
are mirrored in practically real time on both of my other News
Servers, the one supplied by my ISP and another one I pay for.
GigaNews, is a Usenet News Server you have to pay for and which is
expensive, but is famous because it carries so many groups, and
because its retention is good. My ISP Adelphia is a GigaNews Reseller,
and while I monthly transfers are limited to 5GB I assume they carry
all the groups GigaNews has to offer because I have access to 105,699
from Adelphia. I assume retention is similar to GigaNews.
My other News Server is cheaper than GigaNews and only carries 31,588
groups, but they carry almost every single one of Microsoft's
Newsgroups.
If Microsoft adds any public newsgroups to its own server you can
pretty much guarantee that they will be picked up by almost all the
other News Servers on the planet except specialty servers that are
private.
This isn't true for example of the Newsgroups on the News Server
forums.macromedia.com. My ISP doesn't carry most of them.
I'm sure Microsoft has in place a procedure for updating their web
interface to these same groups which you access with your browser (way
more inefficient than using a Newsreader) with any new groups they
carry.
As for Google Groups, I think Google actually has some Groups, they
are trying to set up, which are pretty inferior to say Yahoo Groups,
which are basically email lists that can be accessed by email
subscription or by a web interface but not by a Usenet Newsreader (not
as far as I know).
When you do a search on Google Groups, I think you are also searching
a historical database of actual Usenet Newsgroup postings. This used
to be Deja News before Google took it over.
..