Event ID - 258

Event Id258
DescriptionAn error occurred while attempting to look up the Assoc-NT-Account value for object <account name>
Event InformationADSI has a Lightweight Directory Access Protocol (LDAP) provider that can be used to retrieve information from the Exchange directory. The mailbox attribute which stores the Primary Windows Domain account has an LDAP name of Assoc-NT-Account. The Assoc-NT-Account attribute does not contain the security accounts textual name, but rather a binary string representation of the SID. Every object in the Windows NT Security Domain has an SID. Also, most of the objects, such as Windows NT user accounts, have names that can be displayed as MyDomain\MyUserName.
Reference Links HOW TO: Find Exchange Recipients Associated With an NT Account

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