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"If the appendix has been shows to be part of the immune system, then how does it no longer follow its original purpose?

Hello?"

Hello. The appendix was originally a much larger organ that digested cellulose. It no longer does that in humans; it does have a very small and unnecessary immunological function. It is a classic example of a vestigial organ.

"Without its wings an ostrich could not run well over rough terrain, in fact its wings work quite well. It just cannot fly."

Thanks for making the same points I did, though you don't understand them.

"So I do not consider the wings to be vestigial, clip its wings and it is almost defenseless against predators as it cannot keep its balance, nor turn near as fast."

Again: Vestigial does NOT mean useless, it never did. Darwin said it only means the structure is not doing one of its old primary functions anymore. Obviously the ostrich wing is a smaller, rudimentary version of a larger wing it's ancestors had. They could fly, the ostrich lost that ability. The wing has a function in balance, but NO LONGER in flying. Therefore, it is by definition vestigial.