That is what the Adobe Customer Support told me before i bought CS 6.0. But when i try to open an InDesign 6 file with InCopy 5.5, i get the message "File can not be opened. Please actualize the additional modules ("PDF.IndesignPlugin" and some more) or upgrade to the newest version..."
Adobe CS told you it was compatible in this regard? That is completing incorrect.
About all you could do is create content in InCopy CS5.5 that would be readably by InDesign CS6.
In short, time to upgrade InCopy. FWIW, it’s only $45.
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