It depends on a number of factors (what are the goals of your site v. the goals of your users) but generally in Enterprise environments and regarding business users, using the work or business email address as the unique identifier is preferred for a number of reasons: -- Less likely to have duplication issues (which usernames often have as usership grows) -- It's a unique identifier that ties back to the company ID -- It's far easier to remember considering how many username/password combinations the given person has in their repetoire for work and play etc. etc. -- Email addresses are extensible to other needs within the business: email outreach, customer support/care, database cleanups etc. etc. Usernames are helpful in Social networking environments if say privacy or "handles" are preferred to "protect the innocent."
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