IRM (versions 10.0.9 and later) adds unique salt values to the password hashing process, so matching passwords generate distinct hash values. Any new account passwords created or modified using Library Manager (10.0.9 or later) are stored with a unique salt. Earlier clients can sign in to a 10.0.9 or later server only if the account was created in a version lower than 10.0.9 and a password change hasn't been effected through the library manager.

Earlier clients can change their password using the Change Password option on the sign-in screen.

For an account without a unique salt, when signed in through a client version 10.0.9 or later, the password hash is seamlessly upgraded to use a unique salt. Earlier clients can't sign in to this account after the password change is completed.