I thought the preferred idea was that questions which work for all versions which currently in standard support don't need to specify a version, while anything else does; so a question like this should specify version 2012, since versions 2008 and 2008R2 are still in standard support but the question doesn't work for these versions. We had the discussion when 2008 was released, because some questions didn't work for 2000, and again when 2000 dropped out of standard support. But people who weren't following QotD back then missed those discussions so don't know about that preference. (The discussion probably also happened when 2005 wqas released - I don't know, I wasn't aware of SQLServerCentral.com back then). So it doesn't seem possible to have a hard and fast rule without an editor putting a lot of effort into vetting questions, and since the SQLServerCentral editor has more important things to do for the site there can be no hard and fast rule.