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You would need to install the oldest version of Office first (for example, Office 2003 would need to be installed before Office 2010). This would also apply to any standalone Office programs, i.e. Word or Excel. This is necessary as the registry keys, shared programs, and file extensions are managed separately for each version.
If a version of Office is already installed on your computer, then it is recommended you uninstall and reinstall this previous version. Remember to follow the process of installing oldest-to-newest when reinstalling this previous version of Office.
In the case of Microsoft Outlook, only the latest version of this program will work. The newest install of Outlook will overwrite any previous versions.
If Word 2010 is installed on a system with multiple versions of Word installed, there will be a delay when opening Word 2010. Microsoft KB 2784668SLN289087_en_US__1iC_External_Link_BD_v1 explains this issue in more detail, and includes a possible workaround for the issue.
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