Managing personal Outlook.com account settings, security, and privacy
Hi ,
I'm Dyari. Thanks for reaching out.
Since you forgot the password as well as the security questions, you have to fill out the recovery form. However, first, try resetting your password using any available verification method:
https://account.live.com/password/reset
Then, use the Sign-in Helper tool:
https://support.microsoft.com/de-de/accounts-billing/manage/i-can-t-sign-in-to-my-microsoft-account
If it does not help, fill out the recovery form with accurate information, such as name, birth date, old phone number, Skype/Xbox information, or subscriptions. Be noted that it takes time until you receive a response.