Personal contact card
The outlook.com account holder needs a personal contact card to identify the user. The information about the email account holder is never consolidated and is intentionally scattered on different webpages never leading to identifying the inbox, sent items and outbox owner
I came back to add this idea again, but it seems it never got started. The more Microsoft repurpose office the more peculiar outlook behave. Offline Address List for outlook.com accounts to compensate for the missing personal contact card. Very strange implications that Microsoft support refuse to help as if it is not their own doing and software.
Henrique Franchi commented
I liked a lot your commentary