If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.
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We upgraded from 5 to 2003, and eventually to 2007. Then we dropped our internal Exchange solution for the Microsoft Business Productivity Online Suite, it made sense for us as we are small operation.
Here is a great link to help you get started:
http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#Index