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If you deployed Active Directory Connector (ADC) with custom versions of the Local.map and Remote.map files, you must make the same customizations to the Exchange 2000 Service Pack 3 (SP3) version of ADC before you upgrade.
Use a tool such as LDP to export the contents of the msExchServer1SchemaMap and msExchServer2SchemaMap attributes before you upgrade ADC. For additional information about this process, contact Microsoft Product Support Services. To do so, visit the following Microsoft Web site: Contact Microsoft
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