Duplicate URLs for the same content is a serious issue with Mambo and Joomla! - perhaps addressed in latest Mambo, but not in Joomla!, where it seems the powers-that-be just don't care about this. I've made several posts about this issue to Mambo and Joomla! forums. Here, for instance, on 18 June 2005, added to a mamboserver thread on Different URLs for the same content, started in September 2004: Wow - months since original post, and this is not solved. Not even a real reply. Odd, really, as important for search engine success: should have one URL per page. - and, ideally, this should be a URL which you stick with. (Not, say, changing as upgrade software.) I used d51SEF for URLs with keywords with Mambo 4.5.0; saw duplicate URLs, and "solved" by auto-generating URL only once, then using this to cut and paste URL when I wanted to link to an item again. (Meant I couldn't use sitemap etc, as would otherwise spawn more duplicate URLs). Belatedly, upgraded to 4.5.2, Just tried 404SEF, had problems. But even Mambo "SEF" URLs doing same. For instance, I have menu with a section link and a category link leading to same article - but if go via section name, then category, get different URL to if go directly via category. Isn't it possible to solve this? Otherwise, seems that I still have to do that tiresome cut and paste for URLs - really, does not make upgrading 4.5.0 to 4.5.2 fun. (Never mind the fancy backend stuff.) Right, back to the hideous cutting and pasting, lest googlebot et al index a ton of my "URLs" for only few pages. - happily, someone posted re Xaneon Extensions Manager, which solved the problem; for Joomla!. this has been developed to become OpenSEF. - but, in answer to another poster, I soon added: First, after trying 404SEF, I found that quickly got duplicate URLs thanks to numbers on them. Posted in wh3 forum on 404SEF with this, and suggestion that maybe could stop the problem by removing the numbers, but reply not too helpful: "I am tired of hearing about multiple urls. ... This is a KNOWN issue that has nothing to do with 404SEF. Get over it or use another product." Anyway, I have tried Xaneon, and working well - not adding numbers, and with just one URL per item; I think as I suggested for 404SEF. (I'm not quite sure how it works; how it chooses which if potential links to an item it actually uses: I guess it's first link you make to an item) Not perfect, but a big help for me. (Bit worrisome, though, that doesn't seem too active lately. [developers upped and left for Drupal; happily, development later continued by others]) rjelks: I have rather few mambo pages in this site, so not too bad to use permanent redirects in htaccess: have record of old URL, then check what the new one is and use this in redirect. For thousands of pages - well, I dunno how you'd go with that. Against which, may be best for long-term. Perhaps better URLs are the future; and if can choose something that can be standard - such as use www dot site dot com/category alias/title alias.html [as I think I'm using; makes for nifty URL], can perhaps keep same URL even if switch the method used to generate it. Could even - shock! - create same URL using non-CMS techniques. Yes, SEO is important, if want visitors via search engines. Till now, hasn't seemed big interest of Mambo development team. Lest of interest, I've a real short article on Mambo and SEO on website, where I've also done piece about SEO in general (maybe ok for newcomers to this; perhaps good for a laugh for hotshots!). Comments welcome in forums. I think this move towards such ready spawning of duplicate URLs is a significant step backwards - more like SE Unfriendly URLs.