Lavabit offered an alternative method to tap into the single user in question but the FBI wasn't interested.
Lavabit could either comply or shut down. As such no US company that relies on SSL encryption can be trusted with sensitive data. Everything from Google to Facebook to Skype to your bank account is only encrypted by SSL keys, and if the FBI can force Lavabit to hand over their SSL key or face shutdown they can do it to anyone."
Link to Original Source