iTThink Group Import Export Plugin is an extension for Groups, providing import and export facilities.
Import Users : Users can be imported and assigned to groups in bulk from a text file.
Export Users : Users can be exported in bulk, including all users or users that belong to specific groups.
Groups Import Export works with plain text files to import and export users. An easy to use and spreadsheet-ready file format is assumed, where user data is provided on a line with information like username and email separated by tabs.
During a bulk import, new users can be notified by email, providing them with their username, password and login link to the site.
Documentation, Q&A, Support
For more details on this product, please visit its Documentation page. Questions can be posted on the Plugin Page. Premium support is provided in the Forums.