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The "legacyExchangeDN" value is shown in the "From" field instead of the "Simple Display Name" in an email message in an Exchange Server 2010 environment
Article ID: 2489941 - View products that this article applies to.
Consider the following scenario:
Note This issue does not occur in an Exchange Server 2003 environment.
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/2746164/ )Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2
To work around this issue, you can change the DisplayName property of user A from DBCS to SBCS.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2489941 - Last Review: February 12, 2013 - Revision: 1.0