Brug af Klassisk Outlook i Windows til administration af personlige mails, kalender og kontakter
Hello, thank you for reaching out to Microsoft Q&A.
May I please know when was the last time you were able to sign in to your @outlook.com account successfully?
According to the Microsoft account activity policy, if you haven't signed in to your account for more than 2 years, your account will be put into an inactive state and will be closed. You cannot even use the account recovery form to recover your account.
See 'Microsoft's Account Activity Policy' here-
Aktivitetspolitik for Microsoft-konto
So, during sign-in, if you receive an error message saying 'This account doesn't exist' or 'Username is incorrect', it appears that your account may have been deleted, and you cannot use the account recovery form to recover it.
If your email address is recognized, keep trying the account recovery form. If you haven't received any recovery emails from Microsoft to your alternate email address, make sure you check your junk or SPAM email folders or use another contact email address and submit the form.