Since the entire pool is down during the process you will have some sort of outage unless users are rehomed. In short - make sure you have the requirements met for in place upgrading and the time set aside. I suspect it will not take long but will complete tonight and post my timings. The edge pool was the last thing that needed an upgrade but I was waiting to get the inside pools completed prior to starting that process. I am happy to say that after the long wait, everything came up as expected and worked as expected. As a reference, the installation of the new Skype pool was completed (along with the Edge) in under one hour (granted basic install, no config, no uninstall). It appeared that the servers were doing little to nothing during every step so I can only assume there is some fail-safe code slowing the process of uninstall and reinstall down. However, the user services pool ran for two hours. The process started at 2:30pm my local time and the PChat pool finished approximately 30 mins later (less to uninstall and reinstall). This was not an issue since all the services are shut down anyway, so there was no apparent communication occurring anyway. I started the process on both pools, all servers, all at the same time. Had I been wise, I would have disabled the Lync services so I would not have to wait for them to start post reboot of the server only to shut them down again so I could begin the upgrade process. The required KB2982006 was not installed on my FE servers so that was where we started, which required a reboot. Once I began the process - installing the admin tools on an admin server (not Lync), I upgraded the topology for the two pools, published, and so far so good. For reference, I have two pools - once user pool and one Persistent Chat pool (need it for demos :)), and edge pool, and a few trusted apps. #Lync 2013 upgrade to skype for business installI was sitting at my desk today, waiting for (ironically enough) a client's new Skype for Business install to complete in a far far away country when I decided - hey, I am not expecting calls today, why not do a quick in-place upgrade to S4B?
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