Hi,
First, go to https://account.live.com/acsr . This is where you'll find the account recovery request form. Start by putting in your personal email, that’s the one you're trying to recover. Then, make sure to use a different email that you can access as your contact email. Share as much information as you can. Even if your memory's a bit fuzzy, that’s okay. Just throw in some estimated dates or any services you’ve used, like OneDrive, Skype, or Xbox. Microsoft relies on an automated system, so even if you’re not sure about something, those partial details might just make a difference.