Making sure your site comes at the top of listings of search engines are probably one of the main issues many Webmasters concern themselves with. One thing that can impact search engine rankings and listings is changing a site's structure. This could be changing file names, like what commonly happens when moving a site from a static HTML site to one that is driven dynamically. Another issue could come from domain name consolidation where you have several domains names and wish to consolidate them into one domain. This is common when a company decides to change marketing strategy or comes through consolidation.