This could be due to a number of factors, including the fact that you have configured Outlook to not prompt for your login credentials. The most likely situation is that you changed the password for your email account but did not update the password in Outlook thereafter.
If Outlook continues to prompt you for your password, you should temporarily disable your antivirus (AV) program or boot into Safe Mode if you are using Microsoft Windows (if you are using Windows). If the antivirus program makes use of an add-in or a firewall, it is possible that Outlook will become unresponsive.
- In the event that Outlook checks for and transmits mail without prompting for a password as a result of either of these two operations, reinstall the antivirus application.
- Outlook can be launched in safe mode to disable add-ins if your antivirus software has not been compromised, or if there is cause to fear it has been compromised. If the password continues to work after this, there is a problem with one of the add-ins, which you must disable, uninstall, or investigate to determine how to remedy.
- Outlook will not remember your password if you erase your email profile and create a new one, or you can uninstall and reinstall the program. It is possible that there is an error in the profile; in this case, generating a new profile will resolve the problem.
- Also, it is possible that the registry settings for the Protected Storage System Provider are incorrect. The HKEY CURRENT USERSoftwareMicrosoftProtected Storage System Provider key, as advised by Microsoft, should be deleted in order to evaluate whether this is the cause of the problem.