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    "I want order entry (or quoting) functionality in the CRM system" - one thing to consider is what they mean by that. E.g., do they just want a unified front-end interface to existing services (to be used as originally conceptualized)? Or are the people using the CRM system (maybe a distinct department) actually going to work with orders in a way specific to them (a way that makes it awkward & undesireable to adapt the orders system for their purposes, so that it may be beneficial to treat it as a separate bounded context in Evans' sense, with a distinct model of orders and related processes) Commented Jun 30, 2020 at 20:53
  • Fair point. Since it's my hypothetical, I will say that they mean they want the standard order functionality available from within the CRM application. It might be more illustrative to consider it in the other direction. Suppose we are decomposing a monolithic ERP, which is currently acting as point of sale. As the first step, we just want to take the existing ordering semantics and split them off into a separate application over which we have more control, but for some time at least orders must still be translatable into to the ERP model for the sake of invoicing etc. Commented Jun 30, 2020 at 23:58
  • In options 1, 2 and 3 if the Orders system goes offline, would that make the entire CRM system to be unavailable as well, or would most of the CRM still work normally and only the Order-related functionality becomes unavailable? There might be better (cheaper) ways to improve the availability of the Orders system than options 4 to 6. Commented Jul 1, 2020 at 10:19
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    What exactly do you mean with one system bringing down the rest? When do you consider that a system bas been "brought down"? I think the answer to that is essential for which of your options are viable and which are not. Commented Jul 1, 2020 at 10:28
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    I think there is one additional option to consider. Keep the sites functionally isolated in all respects, and build an SSO (Single SignOn, e.g. using OAuth) from CRM to order management. Commented Jul 1, 2020 at 21:26