Managing personal Outlook.com account settings, security, and privacy
@Will said
I assume someone has changed my email and made it near impossible to recover?
I don't want to offer any false hope, but there are a few other things you can try:
1 -- Identify the new account alias email
If you still have access to any past Microsoft security notifications, review them for clues about what the new account email might be.
Look for emails in Classic Outlook PST/OST files, email archives, forwarded messages, backups, screenshots, printed copies, any alternate email accounts you added to your Microsoft account for Two Step Verification. Any place where some of your older messages might have been preserved.
2 -- If you find what might be the new account email
- Try it in the Microsoft Sign-in Helper:
- In a Private/Incognito browser session, open: https://aka.ms/sign-in-helper
- In a Private/Incognito browser session, open: https://aka.ms/sign-in-helper
- Scroll down to "Choose how you normally sign in, then enter your details"
- Click "With an email address"
- Enter the email address and click [OK]
If the alias exist, try the Account Recovery Process using that alias, but all the other data from when you still controlled the account.
Account Recovery:
3 -- If you ever used this account on an Xbox
Try the Xbox Account Recovery Form
https://support.xbox.com/en-US/forms/recover-your-microsoft-account