Why Is mail.facebook.com Pointing To An Outlook Web App Login?

This whole Facebook Mail thing is getting curiouser and curiouser. After our post on Facebook taking control of fb.com, a number of people have reached out to say that mail.fb.com actually resolved to mail.thefacebook.com (that doesn't seem to be the case for all people). What's interesting about that is that mail.thefacebook.com (and mail.facebook.com) is live for all to see. It's an Outlook Web App with a nice big Facebook logo that asks you for a username and password.

Outlook Web Access for Exchange

How to Check Whether an Email From Facebook is Genuine or Not – The Domino Elf

Enable External Email Forwarding From Microsoft 365 - Re:amaze

New Outlook for Windows - What you need to know — LazyAdmin

Is the Email Alert from “security@facebookmail.com” Legit?

Search Mail and People in Outlook on the web - Microsoft Support

How to Check Whether an Email From Facebook is Genuine or Not – The Domino Elf

Email App for Any Mail - Apps on Google Play

Simple Outlook Web Access Phishing

Facebook's One Click Login Tool Goes Against Best Security Practices - The Ringer

Is This Facebook Email a Fake?

Different signatures added to emails sent from shared and user mailboxes

Exchange 2013 - Using OWA (Outlook Web App) - Support