> 5 years, those days are long gone...... or never were ? 
> computing has only been around usefully for about 50-60 years 
> or so; which means 5 years is approx 10% of the the entire 
> lifetime of computing.....

Yeh true and 20 years ago a new version meant getting out the wire-wrap
gun and delving into the backplane just to fix floating point ops. And
I'm not talking about little machines here.
> 
> 18 mths is my timeline to stability with a heavy dose of risk 
> analysis.

Maybe that is too long ;-) it is whispered that ie5.5 is rock solid and
I don't think that is 18 months old yet.

Ciao Chris

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