Outlook is configured to prompt you for credentials Incorrect password cached in credential storage Required Authentication Settings for outgoing server and incoming server Outlook Anywhere is not configured to use NTLM Authentication Corrupt Outlook profile Slow or unstable ne...
Simply un-installing/re-installing Office for this type of issue is generally a complete waste of time since the email account info is contained in the Outlook profile which survives an u/re-install process. With Outlook closed, go to the Control Panel <Mail> app and create a <new> profil...