I've always been told that Michael was another name for Jesus before He became a man.
The word angel means messenger. Jesus had the most important message (highest).
So He would be our Archangel.
Rev. 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
Jude 9 Yet Michael the archangel, when contending with the devil he disputed about the body of Moses,...
Satan didn't want Moses to go to heaven but Jesus took him.
John 11:25 Jesus said unto her, I am the resurrection, and the life: he that believeth in me though he were dead, yet shall he live:
Daniel 12:1 And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book.
That's the second coming. Daniel was before Jesus was born and since he calls Michael "the great prince" I think Michael is the one we now know as Jesus.