Is it possible to assign a CRM task through outlook to a non CRM user and keep track of the progress in CRM

I created a task from CRM and synced the task with outlook, from outlook tasks i assigned the task to someone from my company which has the same domain but does not have a CRM user, he manged to update the outlook task and send me a report but when i sync outlook with CRM afterwards the case on CRM does not change and stays open.

any suggestions? is it possible