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The path of least resistance for your existing Solaris SPARC infrastructure is to upgrade to new Oracle SPARC servers. This is a good approach for organizations looking to minimize change and risk. With the Solaris Compatibility Guarantee, it is likely that your existing applications will continue to function correctly on the new hardware whether you choose Solaris 10 or Solaris 11.
There are a number of hazards to avoid, but also several quick wins if you know where to look.