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I have upgraded magento from 1.5 to 1.8, everything is working fine apart from custom URL.
Custom product URL is not working even after reindexing everything.
is there any way we make old custom URL workable in Magento 1.8.
I think that your .htaccess file has been overwritten.
Compare your new .htaccess with your backup and make sure your rewrite rules are in there.