Is grape juice ok to drink in an unopened can with the expiration date 5 years ago. It has also been refrigerated though unopened.
As long as the can is undamaged, and in good condition, it is safe. Expiration dates are typically used to define a period of time when the product is of the best quality, rather than to define safety. Since this was very likely a pasteurized product, it most certainly did not turn into wine or vinegar. It might not taste great, but if the can remained sealed it will not be unsafe either.