HCL has just published a whitepaper that explains how to install Sametime 12.0.3 on Windows step-by-step, run it on the same computer as an existing Domino server, and customize the user interface.
This is a companion discussion topic for the original entry at https://www.robertoboccadoro.com/2026/03/10/new-hcl-whitepaper-on-sametime-chat-server-on-windows/