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Lots of potential reasons not to upgrade, including
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cost of retooling (updating programs, stylesheets,
search protocols; retraining staff);
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cost of migration itself, although low, may be too
much for projects with a lot of data and not much
funding (e.g., no longer in active development);
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interuption of workflow would be too disruptive;
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If it ain't broke, don't fix it … if P4 is
working just fine for you, why switch.
P4 should be supported (bug fixes, pizza chef) for at least
5 years after P5 is out. Expertise will exist for even longer.
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