I have a J1.5 site that is being migrated to 2.5. However, due to the changes in the way J2.5 handles SEF URL's the existing URL's are not being copied over, the aliases have to change and I don't want that. I need the old URLs to remain valid after the migration.

I tried installing JoomSEF on the 1.5 site, having it crawl the site, then exporting the URLs and importing them into the 2.5 JoomSEF but after doing that the URLs still don't match. They are closer than with the migrated aliases that were created, but they still do not match the URLs from the old site.

Did I miss a step somewhere in this process or am I just out of luck in regard to keeping the old URLs live?

The two sites in question here are listed below in case anyone wants to see what I am talking about:

www.bestinscience.com/

new.bestinscience.com/