Question : Exchange 2007 some groups get Calendar invites just as email

hello,
We are using SBS2008/ Exchange 2007, recently migrated from SBS2003 / Exchange 2003.

One problem we're having is certain groups (and even a couple of individuals) when they receive Calendar invites, it just comes as an email, no options to accept / reject the meetings.
There doesn;t appear to be any pattern to it, most groups and individuals work fine, just a few don't

Answer : Exchange 2007 some groups get Calendar invites just as email

RewriteRule ^(RealNews/([0-9]+).*)$ http://archvies.realvail.com/$1[NC,L,R=301]

If both sites (www and archives) are on the same vhost, add this rule before the rewriterule:
RewriteCond %{HTTP_HOST} !^archives.realvail.com