Additional Windows Live Messenger PIC/Federation IP Addresses

Notification   In an effort to provide enhanced capacity and service reliance, Windows Live Messenger will soon be adding additional IP addresses used for PIC/Federation traffic.  Some organizations have chosen to restrict this type of traffic to specific IP addresses, as referenced in Microsoft KB 897567 (  With this in mind we want to give…


Federation and/or PIC may fail against partners using 2048-bit signed Root CAs

  Summary:   You may find that OCS 2007 / OCS 2007 R2’s Federation and/or PIC fails against partners who do not support Entrust root certificates signed using a 2048-bit public key.   For example, the “broken” certificate chain may resemble the following:   Edge server’s certificate -> Entrust L1B chain -> Entrust 2048 Root…


OCS 2007 R2 Federation may fail against Lotus Sametime

  Summary: Using Microsoft Office Communications Server 2007 R2, Federation may fail against organizations that are using Lotus Sametime.   Resolution: IBM has a hotfix which addresses this issue within Lotus Sametime.   More Information: Please refer the following IBM support document; Ref #1389588  


RESOLVED – Federation with Microsoft is down (aka: "It’s not you, it’s me.")

  We’re actively debugging this, and I’ll update this post once we have this resolved. UPDATE (6pm, Eastern): We have identified the issue, and will be making changes this evening to rectify the issue.  Things should be resolved by tomorrow morning. UPDATE 2 (9pm, Eastern): Huge thanks to the RTC Ops, RTC SE, and Core…