I would try thawing some, and if it smells okay I would try it (making sure it was cooked throughly). My mom bought a bunch of organic, local beef b/c she is opening a store, BUT, didn't get the store open before the beef was too old to sell. It is at least 5 years old now, (and it has even been partially thawed and refrozen due to a freezer malfunction), we are using it and it is FINE. The quality of meat does deterioriate while frozen, but it isn't like it goes bad while in the freezer. If it smells okay and you trust the source I would totally use it.