" What is defined as "the Church" here, K? Does it include Anglican, Catholic, and/or Protestant churches?"
I was refering to Orthodox people who marry outside the Orthodox Church. The GOA recognizes Roman Catholic marriages so if a Roman Catholic couple converts to Orthodoxy there is no need for a new marriage in the Orthodox Church. But if an Orthodox person marries in the Latin Church, they cannot receive the sacraments in the Orthodox Church. I don't know about Anglicans and with Protestants the marriage is not recognized so when they convert, they need to get married again.
Interesting. This is not the case in my Antiochian Orthodox parish. My wife and I were married in an Episcopal Church, but there was no inquiry where we were married or even if it was a church ceremony.
I have not seen any "remarriage" ceremonies in the parish. Maybe that's because we are 95% converts (not counting the children).