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AAP
AAP
Paul Osborne

Optus finally makes call on cause of outage chaos

Optus says a software upgrade was behind a massive outage that affected millions of people. (Dean Lewins/AAP PHOTOS)

Optus is blaming a software upgrade for an outage that left millions without phone connections and internet services.

A 12-hour outage on Wednesday left 10 million individuals and businesses unable to make or receive calls or complete transactions.

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