To the best of my knowledge there is no settled teaching within Orthodoxy on this point. Here is something from the Ecumenical Patriarch which indicates, at least to me, that he himself is not really too sure about things. Sometimes the Orthodox seem to feel obliged, quite unnecessarily in my view, to profess to have a viewpoint and opinion to offer simply because the Roman Catholics have such meticulously defined views.The Patriarch and the Immaculate Conception
In December of 2004, the Italian Catholic newspaper Thirty Days
ran a story about the 150th anniversary of the Roman proclamation of the Immaculate Conception as dogma. As part of that, they interviewed Ecumenical Patriarch Bartholomew about the Orthodox Akathist to the Theotokos -- a truly beautiful prayer/poem/song -- and in passing asked him about the Roman Catholic dogma of the Immaculate Conception. The Patriarch politely told them that it was wrong, and correctly identified its roots as being in the notion of original sin. It is a brief but excellent presentation of the Orthodox position: (Question): The Catholic Church this year celebrates the hundred and fiftieth anniversary of the proclamation of the dogma of the Immaculate Conception. How does the Eastern Christian and Byzantine Tradition celebrate the Conception of Mary and her full and immaculate holiness
Bartholomew I: The Catholic Church found that it needed to institute a new dogma for Christendom about one thousand and eight hundred years after the appearance of the Christianity, because it had accepted a perception of original sin – a mistaken one for us Orthodox – according to which original sin passes on a moral stain or a legal responsibility to the descendants of Adam, instead of that recognized as correct by the Orthodox faith – according to which the sin transmitted through inheritance the corruption, caused by the separation of mankind from the uncreated grace of God, which makes him live spiritually and in the flesh. Mankind shaped in the image of God, with the possibility and destiny of being like to God, by freely choosing love towards Him and obedience to his commandments, can even after the fall of Adam and Eve become friend of God according to intention; then God sanctifies them, as he sanctified many of the progenitors before Christ, even if the accomplishment of their ransom from corruption, that is their salvation, was achieved after the incarnation of Christ and through Him.
In consequence, according to the Orthodox faith, Mary the All-holy Mother of God was not conceived exempt from the corruption of original sin, but loved God above of all things and obeyed his commandments, and thus was sanctified by God through Jesus Christ who incarnated himself of her. She obeyed Him like one of the faithful, and addressed herself to Him with a Mother’s trust. Her holiness and purity were not blemished by the corruption, handed on to her by original sin as to every man, precisely because she was reborn in Christ like all the saints, sanctified above every saint.
Her reinstatement in the condition prior to the Fall did not necessarily take place at the moment of her conception. We believe that it happened afterwards, as consequence of the progress in her of the action of the uncreated divine grace through the visit of the Holy Spirit, which brought about the conception of the Lord within her, purifying her from every stain.
As already said, original sin weighs on the descendants of Adam and of Eve as corruption, and not as legal responsibility or moral stain. The sin brought hereditary corruption and not a hereditary legal responsibility or a hereditary moral stain. In consequence the All-holy participated in the hereditary corruption, like all mankind, but with her love for God and her purity – understood as an imperturbable and unhesitating dedication of her love to God alone – she succeeded, through the grace of God, in sanctifying herself in Christ and making herself worthy of becoming the house of God, as God wants all us human beings to become.
Therefore we in the Orthodox Church honor the All-holy Mother of God above all the saints, albeit we don’t accept the new dogma of her Immaculate Conception. The non-acceptance of this dogma in no way diminishes our love and veneration of the All-holy Mother of God.http://minorclergy.journalspace.com/...rd&entryid=145