How do you obtain a previous version of Adobe InDesign after purchasing the latest version?

If I purchase the full version of the latest Adobe InDesign software (currently version CS6), how do I obtain a copy of a previous version of InDesign (such as version CS5)?
I need to be able to generate CS5 INDD files for the completion of a project, but I don't believe this is possible unless I have CS5 installed.
I am aware that I can save to an IDML file in InDesign CS6 which can be opened in a previous version of Adobe InDesign, but the requirements of the project require INDD files that can be opened in CS5.

Thanks again Jeff, I really appreciate it.
In case anyone reading this needs it, the following link describes the backwards license process:
http://www.adobe.com/volume-licensing/policies.html - CLP and EA policies section.
And the information link for volume licensing available:
http://www.adobe.com/volume-licensing.html

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