differences between the versions

hi all

can any one tell the difference between the versions of 6.01 ,6.5,7.0.1,7.1
and their versions upgrades , their features and upgrades in architectural design , their concepts , and their packages support ,

plz help me out in this regard as u ll knew but u need some time to spare to write all this , but plz do this as knowledge is divine n the more u share , the more u get blessed

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