Using classic Outlook for Windows in business environments
Hello Riaan
I'm Diane, an Office Apps & Services MVP specializing in Outlook, and I’m happy to help you today.
At this time, it will only open in the on the web version of Outlook. This is because the To-Do app links to the web version of Tasks and uses deep links to link to the associated Outlook item.
You can leave a suggestion that it open in Outlook desktop -