I have a Microsoft Office Communications 2007 Server Standard Edition running on a Windows 2003 server. It has operated fine for years, but within the last week users are no longer able to IM (we don't use the calling features) with more than one person
at a time. I've searched the web and everything keeps referring to a certificate issue, but I have verified that our service certificate is valid until 2013. It was issued by our internal CA authority.
I believe that when I first deployed OCS 2007 and the issue was not with the certificate, but with a setting. Any assistance to resolve this issue is greatly appreciated.