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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Not sure if your calendars are setup as resources, but if so, according to MS, the end result is by design: http://support.microsoft.com/default.aspx?scid=kb;en-us;280854&Product=ol2002
here is the URL to the issue:
http://www.experts-exchange.com/Software/Office_Productivity/Groupware/Outlook/Q_20944175.html?eeSearch=true