I found something that might be interesting. What a way to confuse every generation...
"...Michael is not the Son of God..." WT November, 1879, p.4
"Jesus, before he became a man, was a spiritual being of a nature superior to angels....he took not on him the nature of angels..." WT, March, 1883, p.4
"Michael, - "Who as God," - the Pope." The Finished Mystery, 1917, p.188
"...the Son of God was known as Michael before he came to earth and is known also by that name after his return to heaven..." Reasoning From the Scriptures, 1985, p.218