I've spent so many days trying to figure this out...
I EXPORTED customers on a Magento 1.3.1 version, got the CSV file but when I try to IMPORT it into a 1.9.1. version - it gives the following Error:
Can not find required columns: email, _website Please fix errors and re-upload file
The file has a website column and an Email column as far as I can see. I've tried adding the _website column and fill it all in with "base" but it does not seem to help. Also tried to rename the "website" parametr to "_website" but it makes no difference. I have base setup as the code for the main store. I appreciate any suggestions very much!