The TechNet OCS 2007 Beta on-line forum at: http://forums.microsoft.com/Ocs2007publicbeta/default.aspx?SiteID=57 is down. It's been down since Friday morning. The outage has been reported, but not yet fixed.
These forums were about the OCS 2007 beta product (and are, or at least were, still missing any links to NNTP). Now that OCS has hit RTM, there is a need for both forums and newsgroups that support the final RTM, product. These are coming, I'm told by folks at Microsoft, hopefully with full gating between on-line forum(s) and NNTP newsgroups.
When I get more information, or if the site suddenly comes back, I'll post more more information.
[Later - 17:45 Saturday Aug 25 - Evening]
I've seen Tata Moraes comment - sadly I have no idea when this forum will be back up. Plus it's a bank holiday weekend at least here, so everyone's away. You could try posting in the microsoft.public.office.communicator newsgroup, although strictly speaking OCS posts are probably off topic there.
[Still Later - 19:00 Monday Aug 7 - 1900]
The outage continues. This appears to be an error in the change over to RTM support and the forums should be back soon. There will be RTM forums, but don't know yet about newsgroup support.