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I found quick and better to block old page urls in Robot.txt, request immediatly pages removal on the webmaster tools. Then just remove old pages on the server.
I use to use 301, but search engines will not pick up the new pages for a while and old urls will stay on search engine.
I know that Google recommend to leave the old url with a notification "Page has moved, bah blah blah" but visitors are smater, they just return to the domain name and find what they are looking for.
Google should index quicker the new pages, so there won't be downtime.
As you may know, when you've got an e-commerce, products change often, manufacturers change their line of products, etc... We constantly update our site with new dynamic pages, and cannot leave hundred dead old pages.
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