Re: Importing new customers and orders since original database upgrade
Something I like to do in this circumstance... while in the 1.3.9h admin, print out the several key Configure screens -- such as Layout Settings, Index Listing, Product Info, as well as any from the Modules, Localization, and other menus -- so you can quickly reset everything once you've got your old database into your new 1.5.0 install. You don't need to waste a lot of paper doing this, just print to PDF, or even copy and paste to your text editor -- anything just so you have a convenient way to recover all those little settings you may need. Somebody (who knows what they're doing better than I) could perhaps make a mod for this. Easy for me to say.
Breakfast: the most important donut of the day.