I successfully exported my customers from Magento 1 into a CSV and then used the import tool in Magento 2 to import them. On the backend everything looks fine and all customers and addresses are listed.
However, if you try to login from the frontend, it says:
"Invalid login or password."
Looking at the customer csv file I noticed that the password hashes seem to be inconsistent. With some older ones looking like this:
And newer ones down at the bottom of the csv file look like this:
I'm guessing Magento updated their hashing method at some point and this is the result.
Any ideas how to make the older ones compatible with Magento2?