Outlook stores your password for all your email accounts that are added in Outlook, but if you have forgotten your password if you want to change it, you need to do it through the provider's website, help desk, or email administrator. Once you have the updated password, you can now change your email account settings in Outlook.
Once Outlook detects that your password has been changed, it will prompt you to provide the updated password.
As an option, you may select the Remember Password checkbox.
To change your account settings, follow these steps:
Open Outlook 2016.
Click the File tab.
From the Account Settings drop-down list, select Account Settings.
Select the email account that you want to change and then click Change.
In the Change Account window, enter your new password.
Click Next after Outlook tests your account settings.
Click Finish and then Close.