with the old plugin users could set regarding for multiple emails by selecting multiple and clicking on Set Regarding.

Is that even possible with the Dynamics 365 App for Outlook?

The Dynamics button is disabled in the emails view in Outlook and its only enabled when you open an email record.

I know how track multiple emails by using Categories, but that doesn't fit our requirements.

This is needed to more efficiently have our team track emails linked to CRM dashboards that monitor productivity. Currently, doing it manually one by one is consuming valuable work time and leading to user inaction.