When we first started getting asked about preservation of coffee, we did our own tests and our conclusion where that our coffee, roasted to an Agtron level > 50 or a Citi roast was able to retain its aroma and fragrance for approximately 2.5 months without any real loss, when kept in the freezer.
Since then we have had a number of clients and other so called ex-sperts saying now this is not the case.
Recently I found an article that was a little more scientific in its approach. I really believe it is worth a read:
You can read the whole article, but the conclusions are important: