Recovery is still possible only through the standard Microsoft account recovery paths, but if there is no access to the old phone or recovery methods and there are very few account details available, the chances are low.
Supported options are:
- Try the Sign-in Helper first. It checks the account details provided and guides the next steps.
- If the password is forgotten, use Recover your account and follow the verification prompts.
- If normal reset does not work, use the Account recovery form.
- When filling out the recovery form, provide as much information as possible. Wrong guesses do not count against the request, and adding more detail improves the chance of success.
- Complete the recovery form from a device and location previously used with that account if possible.
- Microsoft reviews recovery form answers and responds within 24 hours to the working email provided.
Important limits from Microsoft:
- If two-step verification was turned on and there is no access to any alternate verification method, the account cannot be recovered through support.
- Microsoft support agents cannot send password reset links or change account details.
- If the account has not been signed in to for more than 2 years, it may have been deleted.
Based on the details provided—lost access for over ten years, no old phone number, no recovery access, and only a few remembered subject lines—there is no alternate escalation path in the documented process beyond the recovery form and sign-in helper. If those continue to fail, there may be no way to regain access.