After loading Snow Leopard sometime later I discovered that I can't open pages.
How did you install Pages? Copying from another hard drive doesn't work as a rule. It is best to reinstall from the original media.
Run Software Update to bring Pages up to the required level for the new OS.
Apple has upped the minimum OS X release to 10.7.4 in order to obtain Pages v4.2 or higher from the App Store.
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