How can I see tasks filtered by category?

After a few tries, i've found another workaround. I've an Outlook 2019 version and u can still force an Categories View.

1. Set View Group by Categories in ur Inbox
2. Then go to Task view and go to Categories and Edit or Add Categories like what u want.
3. Then Create a "Pseudo" Task in an Category ( this is neccesary to show off the category).
do this for every Category which u need.
4. Set Task View in ur Inbox

Now ur Screen in ur Inbox  should look sth. like this

Now if u want to Assign a Category on an Email, u have to Flag ur Email first.

Then the email should appear on the right as unassigned task.

Now u have to go only once in the task view and then u can go back to ur inbox this is neccessary to move the mail to an other category otherwise it comes an error that the mail is modified and u cant do that. .

Now u can drag and drop ur mail in ur category which u want.

And when ur Task is over u can drag the Mail for example in an Category like Done

It not perfect, cause u have to drag and drop ur mails in ur inbox for change the category, but i think its quite okay i u want to still work with categories

best regards