InDesign CS5 Backwards Compatibility??

Question

My client uses CS3. She sent me an INDD document to revise, save, and send back to her, but guess what!? I can't! I can export as IDML, but InDesign CS3 cannot open IDML files. Unless I'm missing a plugin somewhere? Any ideas? Why, oh why, did Adobe do it this way?
Is there any other way besides tracking down a friend with CS4 and begging them to export as an INX for me?
Just a note - I've regretted getting CS5 since the day I installed it. Nothing. But. Problems.
Client and I both work on Macs, if that matters for plugin purposes. Any info at this point is helpful. Thanks in advance.

Answer 1

madhatterdesignco wrote:
And beyond that, why would I want to take up hard drive space with two versions of the same program? My point is that Adobe made a mistake, assuming there are no plugins for CS3 that allow for the opening of IDML files. I haven't been able to locate anything, which is why I asked here.
And sorry, I think I understand what you're saying about "one version" backwards saving. But like I said, that's not an option for me.
As  I said, the one version thing is not new. Been there since CS2, the first version that could export a file that was at all backward compatible, and it is not unique to Adobe. The differnces between versions are significant, and back-saving is very unreliable for any file that should look the same after conversion.
Why would you want both versions? To be able to work with legacy files and service your clients.