It depends how confident you are that running a marathon is difficult. If I tell you that a five year old ran a marathon, that's one impressive five year old.

It depends how confident you are that running a marathon is difficult. If I tell you that a five year old ran a marathon, that's one impressive five year old. If I tell you that I organize a whacky foot race every summer and that a five year old finished it last year, my whacky foot race is probably not very challenging. A priori, I don't really know how hard Microsoft certficiation is, and I don't know how talented this five year old is. But reading the article tells me that he is probably quite talented, and that Microsoft certification is probably not that challenging.