To expand on what my esteemed colleague has posted. You have to do a parallel upgrade which allows you to install and test on the new server while people are still working on the older server. You can migrate data, convert data, setup new forms all the while people work away on the old server. When you have everything worked out all you have to do is convert the live data, run work station setup and go live without a hitch. Note that you would want to make a copy of the live company and migrate over this copy and test.
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