Appeal court judges delivered different rulings on the three convictions Tony Mokbel contested. Photo: Joel Carrett/AAP PHOTOS

Two of underworld figure Tony Mokbel's convictions must be set aside because barrister-turned-informer Nicola Gobbo's improper actions "infected" the cases, an appeal court has ruled.

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Mokbel, 60, walked jovially into the Victorian Court of Appeal on Friday morning, hoping all three of his drug trafficking and importation convictions would be quashed.

But justices Stephen McLeish, Maree Kennedy and Stephen Kaye only ruled in his favour on two convictions - k

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