SSPR WebReset
SSPR Enrollment
There is now a web reset page that after answering three questions correctly you are able to “set” your new password. The external user can then log into SharePoint, OWA, web apps, etc. without having to change their passwords. This works for account lockouts and forgotten passwords.
Enroll in the Password Reset system and can reset passwords online and not require it be changed at first login.

Watch Enrollment "How-to" Video | View Frequently Asked Questions