You need any environments that Redmine work on.
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$ cd REDMINE_ROOT
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$ ruby script/plugin install git://github.com/suer/redmine_ms_projects.git
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save a MS Project format file(.msp) as an xml format(.xml) with MS Project
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access your a redmine project, then click “MS Project” tab
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select xml file, and click save button
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select tasks that you want to import, then click save button