Since I'm flying regularly with StarAlliance, I joined their frequent flyer program miles and more. There, you can earn two different kind of miles, status miles and award miles. The status miles are their to upgrade your frequent flyer status so that you have higher booking priority or access to lounges. With the award miles you can buy flights or similar things.
Now the problem is, I don't understand what the expiration rules are. The status miles expire after one calendar year, but how does it work with award miles? I can't find any reliable information, so I'm looking for documentation about that.