What are the major advantages of using Active Directory group in SharePoint?

• Security behind AD is intense. Microsoft's entire enterprise of applications all utilize AD for security
• Allows for client integration, so opening word doc from a library will keep the file connected to SharePoint. This is a little more complex with FBA
• Assuming your're using AD for internal users, you can centrally manage all your users in one auth store
• You can use AD groups in SharePoint
• Easier management of single sign on and BDC connections (if you're using them)
• Active Directory's real benefit lies in Domain management and Integration with other programs (particularly ones like exchange)

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