Beginning in Odoo 9, the user and login form prompts for email as opposed to username. This practice has continued in Odoo version 10 as well. It is still possible to use a user name instead of email address, but given the strong encouragement to use email address in Odoo 9 and Odoo 10, it is possible that in future versions of Odoo the requirement to provide an email address may be more strictly enforced.
Email address
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