What is Microsoft Dynamics 365? Before we answer this question- let's discuss what was offered before Dynamics 365. Historically, there was CRM online, which you could also get as an on premise version and there was Dynamics AXE. There was a separate system where CRM users, for the most part, functioned in a CRM environment, with minimal connections to ERP. Users would have separate CRM and ERP systems, and would have to navigate between the two in order to execute a full end-to-end process. However, Microsoft's former release rebranded these two tools and combined them in a force known as Dynamics 365.