Product availability calculation has been changed in 2007.1 to no longer be based on the (deprecated) Product#isAvailable . The logic however did not cover the old default if no availability service was provided for the commerce integration. If this was the case the old implementation did return "true" while the implementation in 2007.1 did return "false". This was not intended, so we changed the logic back to return "true".

(CMS-17979)