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Therefore, is it okay have both versions online till the newer version is indexed, or should the older version be removed asap? Please advice on the course of action that should be taken.
Thanks.
> Therefore, is it okay have both versions online till the newer version is indexed, or should the older version be removed asap?
Faced with a situation like that, I would remove the old version. Before doing so, I would set up a up a 301 redirect (Permanently Moved) which would redirect the spiders and visitors to the newly named pages. This way your existing PageRank (Google) will be passed on to the new pages. You'll have some work to do depending on how many pages there were that got renamed.
You need to put a meta tag Robots, content="NOINDEX,NOFOLLOW" to stop the spiders from re-indexing.
Or, you can delete the files and use mod rewrite (Apache servers - if your host allows it) to have 'duplicate' filenames. Search this site for rewriterule for more information.
I concur with Knowles, you should have a 301 for each of the pages that have changed file names. Depending on how long the old site was up, there could be 100's of links, if not 1,000's that you need to take into consideration.
The only problem is with bookmarks. Those people won't know that the page name has changed. Neither will those linking to you unless their stats give them that information.