I currently use oscommerce for a small online store, and have recently rebuilt the store using Zen Cart.
The database needs to be copied across to the new host without altering or deleting the database on the old host – the current website is still live on the old host, and needs to remain so while I test the new site on the new host.
All account information must be moved across and re-integrated as well as product catalogue and structure, reviews and any other information held in the DB. All accounts also need to have the ‘receive newsletter’ option enabled, as this was not available previously for all account creations on the old site, and all customers need to be contacted once the move has taken place.
The cron job needs to be duplicated on the new site also, and not removed from the old host. It will need to be adjusted to run at the same times to the same effect on the new host, and an additional line or two of code added so that it also lists postage method with each order (already includes address and order details)