” 23.  There were, originally, countless contradictory versions of the Koran until Caliph Uthman ordered the Qur’an collected into one volume about 40 years after Muhammad died. (about 650 AD) cf. Hadith 709 & 507.

The only reason the modern versions of the Koran have only small variations between the various versions, is because a formal edict was issued in 800 AD that outlawed, under pain of execution, the possession of any Koran version other than the one chosen by Caliph Uthman. (Basically, Caliph Uthman chose a version of the Koran that we was familiar with.) Historically, it was not even the best choice, but the most convenient choice.

Contrary to Muslim claims, there are no ancient copies of the Koran dating before 745 AD in museums.”


Quoted from:  http://www.bible.ca/islam/islam-encyclopedia-westerners-need-to-know-list.htm