How Ready is Zentyal to Replace WIndows Server as an SMB Server?

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http://askubuntu.com – By "SMB," I mean small-to-medium business, not Samba. I'm playing with Zentyal, but I don't have the resources to do a full-on test of the system. Has anyone moved to this at work? How has it helped / hurt? Is anyone running 3.0 yet? (HowTos)