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The External Data field type enables users to add data from external content types registered in the Business Data Connectivity (BDC) service metadata store to SharePoint lists.

Microsoft SharePoint Server 2010 provides a field type called External Data that is available to all regular SharePoint lists (except External lists). The External Data field type enables users to add data from external content types registered in the Business Data Connectivity (BDC) service metadata store to SharePoint lists. To decide whether you should create an external list or use external data columns in a regular SharePoint list, see this topic.

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