It's not enough to simply model a domain as commands and events. A robust solution needs to deliver said commands and events (collectively, hereafter: messages) quickly and reliably. MessageRouter, a recently open-sourced tool developed at Quicken Loans, solves exactly this problem. Using CQRS as a backdrop, this talk will explore the use of actor-based concurrency (via F#'s built-in asynchronous programming features) to build the message-dispatching core of a real-world system. In addition to the purely technical aspects of MessageRouter, this session will also discuss solutions to some of the challenges faced in building polyglot enterprise software on the common-language runtime (i.e. Mono or .NET). While no prior exposure to CQRS or F# is assumed, attendees will benefit from having, at least, a basic working knowledge of the common-language runtime.