Kernrechtsfrage
Whether the appeal against the IV decision of 15 February 2011 was timely despite disputed service.
Extrahierter Entscheid
The administration failed to prove service of the decision to the insured; the appeal period therefore could not be held to have run against her on that basis.
Extrahierte Begründung
For undelivered ordinary mail, the administration bears the objective burden of proving service and its date. In doubt, the recipient's account prevails. The cantonal court violated federal law by assuming service without sufficient proof.