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</source>
You can use the following logical check so that the package set will run against machines with Office 2000 and 2003, but not on machines that already have 2007 installed.
<source lang="xml">
<check type="logical" condition="or">
<check type="uninstall" condition="exists" path="Compatibility Pack for the 2007 Office system" />
<check type="uninstall" condition="exists" path="Microsoft Office Enterprise 2007" />
</check>
</source>
[[Category:Silent_Installers]]
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