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Virtual class not allowed in this organization

I am getting the message above when I try to create a virtual class than can be overridden in my developer environment.  Page 71 of the apex developer's guide says "Note: abstract and virtual are not enabled for all organizations.  If you need them for your application, contact your salesforce.com representative".  When I contacted support, no one seems to know anything about this, even though it is clearly stated several times on pages 71-80 of the apex developers's guide.  Is this feature not available yet?  How do I get this enabled as soon as possible?  thanks