So the code is about done, with the service running, allowing users who are in the SharePoint site to authenticate, and see other site users in their contact lists. Conversations can be created, and sent across the wire, and other clients receive them! Logging is enabled and saves entries to a list, and that list is searchable, so you can find items from your previous conversations. A couple bugs to fix on locking issues, but pretty much home free. Now to start going over how to present the code, WCF first, SharePoint, WPF? I am thinking WCF, the basics,...