Microsoft Skype/Lync Federation change for new IP address October 2 2015

While most customers and partners will receive this information via their account teams, I am sharing for broader reach.

We are updating the way our customers/partners federate with Microsoft.


Prior to the change on Friday, October 2, 2015 at 8:00 PM PDT, customers need to update their federation using URL filtering.

If you or your customers “hard-code their IP addresses,” they will need to allow IP: to ensure there is no interruption to their federation with us.

Going forward, please use “URL filtering” on, which means you won’t need to update your IP addresses when Microsoft makes a change anymore!