Lync Online Users Are Unable to Sign into Lync Mobile Clients Due to Lync Online SSL Certificate Updates

Lync clients on a Windows Phone 7 device (and possibly other devices) are not able to sign in to Lync Server due to a missing root certificate chain for Baltimore root certificates. Check out this article for the step-by-step solution. Authors: Moustafa Noureddine, Microsoft Senior Program Manager Lead | Mark Barringer, Microsoft Service Engineer Published:… Read more

How Changes to Public Certification Authority Standards Will Affect You

Certificates and the public key infrastructure are complex topics, even without having to understand impending change. Changes in the request criteria and format of certificates—subject name, common name, subject alternative name—are coming in November 2015. Although this may sound like the distant future, a certificate is typically valid for 2 years. This means you need… Read more

Updated: Creating a Certificate Revocation List Distribution Point for Your Internal Certification Authority

Certificates rely on certification authorities to maintain an updated list of revoked certificates issued by the public key infrastructure. Certificates are revoked for a number of reasons—not all revocations are for compromised certificates or nefarious reasons. It is essential that when a computer is presented a revoked certificate, that it does not honor the certificate…. Read more

Lync 2010 Client Authentication

Users have multiple options for login into Lync Server 2010. Users can use Lync 2010, Lync Web App, Lync Mobile, browser connecting to the simple URLs, and Lync Attendee. Each of these clients uses different protocols when authenticating the user to Lync Server. This article dives into the details of how each of these clients… Read more

Begin and End Tags on Certificates: Gone in Communications Server 2007 R2?

Communications Server 2007 R2 provides a Certificate Wizard to ease the process of creating certificates. However, it appears that the certificate signing request (CSR) does not contain all the information necessary for some certification authorities (CAs). The purpose of this article is to create awareness and provide guidance for working around this issue. Author: Rick… Read more

Important Resource for Deploying Certificates in Communications Server 2007 and Communications Server 2007 R2

This article highlights the information contained in “Deploying Certificates in Office Communications Server 2007 and Office Communications Server 2007 R2,” available as “Office Communications Server 2007 and 2007 R2 Certificate Guide.doc” at to help you with the important task of deploying certificates. Author: Kate Gleeson Publication date: January 2010 Product version: Communications Server 2007… Read more