“Set Regarding” works very well when tracking emails in Dynamics 365 yet can only track to one entity. Our goal would be to allow the use of this feature to track more than 1 case/account/contact/etc... or different entities on a single email. “Set Regarding” as designed looks to have the tracking of cases, appointments, events, etc, orderly and avoid confusion or mix up between records and emails that may not be directly related between them. It would help out when content in an e-mail could behave in various scenarios.