title: Magento - How do I merge an updated products database with a live customer database?
body: <p>Currently I have a live Magento 1.4.x site and a 1.6.x development site. I have put some new products into the 1.6 site and a couple of test transactions. </p>
  
  <p>I would like to be able to import the existing 1.4 customer data to the 1.6 site (instead of recreating my products on the existing 1.4, which is doable but not what I want to do.)</p>
  
  <p>My plan is to delete the sales_, customer_ and newsletter_ tables from the 'dev', then copy the live 1.4 to some other database, quickly upgrade that to 1.6, mysqldump sales_, customer_ and newsletter_, import the data into 'dev' and then set 'dev' to live. </p>
  
  <p>I can test this procedure, see how long it takes and then do it at night, hopefully not needing to be in maintenance mode for too long. However, has anyone else done this task already and am I missing out on any really, really important tables to copy across or anything else of concern?</p>