User tasks are so intertwined with Outlook, Planner, To-Do etc, I'm surprised Microsoft hasn't bothered to link this up!. I went to try and use User Tasks for the first time and got real shock to see that whilst tasks exist, you cannot link them to a specific "thing to be done" (i.e. a sales order, purchase order etc.). The functionality to 'link task to' is there, but only to a report or page (not sure who thought that was a good idea... but ok). To be truely 'useful' tasks need to be linked directly to the record that requires the task (Customer, Vendor, Sales document (any of), Purchase Document, Opportunity etc.) AND put a button or include it directly as an action from these records (i.e. on any sales order, I should be able to go Actions>Create Task and add a task for that sales order etc.).