If I have an article on another site that I would like to move to Hubpages, will it show up as duplicate if I publish it after I have unpublished it on the other site. Do I need to delete it from the other site?
HubPages may reject it if you republish it too soon after removing it from another site. Many people wait until it no longer appears in Google Cache, and then move it. You can check if Google still has a cached copy by searching for the exact url or exact title.
You can help the HubPages community highlight top quality content by ranking this answer up or down.