Well, we had Persona working as both as GSS-API mechanism on Unix and a SSP on Windows. You could use it to sign-in to Exchange with Outlook - that was pretty cool. Links here:<p>* <a href="https:&#x2F;&#x2F;hacks.mozilla.org&#x2F;2013&#x2F;04&#x2F;mozilla-persona-for-the-non-web&#x2F;" rel="nofollow">https:&#x2F;&#x2F;hacks.mozilla.org&#x2F;2013&#x2F;04&#x2F;mozilla-persona-for-the-no...</a><p>* <a href="https:&#x2F;&#x2F;github.com&#x2F;PADL&#x2F;libbrowserid" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;PADL&#x2F;libbrowserid</a><p>* <a href="https:&#x2F;&#x2F;tools.ietf.org&#x2F;html&#x2F;draft-howard-gss-browserid-07" rel="nofollow">https:&#x2F;&#x2F;tools.ietf.org&#x2F;html&#x2F;draft-howard-gss-browserid-07</a>