database migration
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The migration tool that the core team developed only handles content.
So at this moment in time, as far as I am aware, migrating users is not possible.
A community member has been working on an add-on for 5.7 and v8 that imports/exports users, user attributes, and user groups.
I forwarded the developer this discussion and they said they are still working on it, but it has not been a priority.
If you have a pressing need for this, I imagine development could be made a priority if you hired the developer to finish it for you.
An alternative is to use an existing add-on that exports users and user attributes. This would still require writing the import code.
https://www.concrete5.org/community/forums/customizing_c5/how-to-exp...
Cheers,