How can I edit the subject, content and or date/time of any email?
You can edit the subject by clicking on it in the message preview and editing it. Hit Enter key when done.
You can’t edit the body or the time the message was sent.
Why not, actually?
Is that planned?
With Outlook, I can edit the body so that I can correct or delete the content.
This is not planned. It seems like you want to create a forgery by altering its contents. It may even be illegal if you do that with business emails.
I am not at all concerned with fakes!
Often emails from the same person are mixed with different information, without reference to the subject.