“There are a few very small incompatible changes - I really doubt most people will ever run into them.”
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Well, the first thing to say is that we've worked hard to maintain compatibility, so that any program written with an earlier version of Mathematica can run without change in 3.0, and any notebook can be converted.
Stephen Wolfram 
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So the thing I realized rather gradually - I must say starting about 20 years ago now that we know about computers and things - there's a possibility of a more general basis for rules to describe nature.
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There are a few very small incompatible changes - I really doubt most people will ever run into them.
Stephen Wolfram
51% of people like this quote