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Resolving account id to name

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :SharePoint
My company uses domain\user id as the account id and it resolves to a main database where all user ids and names are kept. When a co-worker puts in the domain\user id on the Add People page and hits the Check Names button, it resolves to the actual name (First Last). When I do so, it just confirms that it's a valid account on the database. What setting am I missing?

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