Was performing a Lync 2013 to Skype for Business In-place upgrade a couple weeks back when during the installation I received the error 1603: Error returned while installing Server.msi(RegistrarStore), code 1603. and then. Error returned while installing OcsCore.msi(Feature_LocalMgmtStore), code 1603. After a bit of investigation I found that initially this deployment was a Lync Server […]