Outlook Instant Search Stops Working After Installing December 2018 Security Update KB4471321

There have been a number of reports recently that the Instant Search feature in Outlook 2016 and Outlook 365 stopped working after installing the December 2018 Security Update KB4471321. Initially, this issue appears to be on Windows Server 2016 when running as a Terminal Server or Remote Desktop Server. There have been a few reports [...]