We're currently preparing to move a Dynamics CRM org from on-premise to online and trying to determine how to maintain user GUIDs. Previously, I didn't think this was a possibility with Office 365, but I have heard conflicting stories. After digging into it, I found one way that seems to work in testing, where we programmatically create the user in CRM, and then add them to Office 365. However, if the user already exists in Office 365, I've had varied success with adding them to CRM to maintain GUIDs. Is there a better approach to handling this?
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