Single sign-on for Windows/Linux/Mac OS X

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http://forums.fedoraforum.org – I am in the process of trying to setup a single sign-on environment where I am at, and I have been trying to use Samba 4, but I keep running into issues with it, and it seems like Samba 4 at least should not be used in a production environment. I could be wrong on that last item, but that is the impression I am getting with documentation and support. I have been reading on FreeIPA and how it integrates with Windows as well, but I was wondering if anyone here had any actual experience with it. I am trying to replace a Windows Active Directory server with a Linux server, but that may be a bit bo (HowTos)