If you receive a message in Mail or Calendar for Windows 10 that your account settings are out of date, there are several things you can do to fix the problem.
The most common cause of an out-of-date account is an incorrect password. Select Fix account in the notification bar at the top of the Mail or Calendar app. If your password is incorrect, you'll see a message asking you to update your password. Enter the new password and choose Done.
If your password isn't the problem, you may have a certificate error. If so, you'll see a message that says, 'There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority.'
This error often happens when you don't use SSL to secure your email account. To fix this error, use the following steps.