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I have an application written in CF8. I need to install this on a machine running CF6. Is it backward-compatible? What issues will I run into? Does it all depend on whether or not I used CF8 (or CF7) features in the application?
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It depends on if the code used any CF 7 or CF 8 specific language or features. It is very possible to move an application to any version of CF as long as tags available on the earliest version were the only ones used. Easiest way to find out is to try and run it. CF will throw an unknown tag error if it finds something wrong.