I am moving from oscommerce to zencart this weekend. I am well listed in google in terms of the amount of pages they have listed, and I get a lot of traffic from them.

I've got my zencart in /zen and my oscommerce in /store. I was going to simply change zen's name to store and rename /store to something else, but I have concerns....

Is there something I have to do to ensure no 404's when someone goes to a product page from google. The urls won't be exactly alike since I have cDynamicMetatags and Ultimate SEO Urls installed in the oscommerce cart...I know it will take some time for google to change the urls from the sitemap I ping them with on Sunday.

Any feedback will be appreciated. Also, any ideas on things I may be missing in terms of being aware of with this migration.