Hi - I can answer Q2. There are two primary ways to extend copilot. First is to build plugins. The second is to build Graph Connectors. Yes, you can create your own Copilot plugins. There are multiple options for creating plugins. You can: Build Teams Message Extensions or Power Platform Connectors (or you can update your existing investments). You can also build/use OpenAI plugins. Fundamentally, a plugin is just a manifest + API, and that API can of course tap into your own custom data sources. You can also create or (or acquire) Microsoft Graph Connectors, which allow you to index additional data sources in the Semantic Index. This will also help Copilot understand things like acronyms used internally, etc. etc. To train an LLM on specific datasets, you'll need to build your own copilot - for example with Azure OpenAI services.