Final answer:
When merging cases in Dynamics 365 for Customer Service and selecting 'Open Activities' as the merge object, open activities from the merged cases are copied to the open activities of the surviving case.
Step-by-step explanation:
In Dynamics 365 for Customer Service, when merging cases, the outcome for the merge process when selecting 'Open Activities' as the merge object is that open activities from the merged cases are copied to the open activities of the surviving case. This means that if there are any open activities, such as open tasks or open emails, associated with the cases being merged, those open activities will be copied to the open activities of the case that remains after the merge.
For example, let's say you have two cases, Case A and Case B, and Case A is the surviving case. If Case A has an open task and Case B has an open email, those open activities will be copied to Case A's open activities after the merge.