Using Outlook for iOS for personal email and calendar management
Hello, thank you for reaching out to Microsoft Q&A.
May I please know when was the last time you were able to successfully sign in to your Microsoft account (old email)?
According to the Microsoft Account Activity Policy, you should sign in at least once every two years to keep your account active. If you haven’t signed in with your Microsoft account for more than two years, your account may be placed in an inactive state and could be closed.
If your email address is recognized, but you forgot your password and no longer have the security information, you will first need to update your security info by selecting “I don’t have any of these” on the Verify your identity screen, and then follow the steps to replace your security information.
Note: If you remove all of your previous security information and replace it with new details, your account will be placed in a restricted state for 30 days.