AD FS endpoints unavailable.

After configuration AD FS I tried to connect to the endpoint "......adfs/services/trust/13/usernamemixed" and to the endpoint "...../services/trust/13/windowsmixed". But I got the error "HTTP Error 503. The service is unavailable.".

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Login to OWA programmatically using saml token.

If you want to change the process of authorization in OWA which is based on a AD FS SAML token than this article is for you. Over there you can find ways of customization the default login form, getting the SAML token programmatically from the AD FS, using this token for authorization, etc.

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