I have an EE site that's based on the latest 1.x version and that has over 10,000 registered members (I tried a couple times to upgrade to version 2.x but it was a disaster). I now want to rebuild the site from scratch using the latest 3.x version and I want to move my 10k membership from the 1.x database to the 3.x database. Is that possible without creating a bunch of nasty side-effects for the new site?
I would read up on this https://docs.expressionengine.com/latest/cp/utilities/member-import.html Not sure if everyone will have to reset their password or not. ;~}