Add or remote server from the Lync pool

https://tomtalks.blog/2013/04/lync-2013-gotcha-when-addingremoving-fes-in-topology-publishing-topology-will-reset-the-relevant-pool/

https://docs.microsoft.com/en-us/skypeforbusiness/manage/topology/manage-front-end-servers


When you add or remove a server to the pool in your topology and then publish the updated topology, it will cause all of the servers in the pool to restart at the same time. While the servers are restarting the pool is offline, which will interrupt service for your users connected to that pool. To prevent any interruption of service to users, plan to publish the topology with the new server in the pool during non-business hours.