Update README.md

README.md

@@ -31,12 +31,11 @@ supported authentication portals:
 
 ### 2. Authenticate for the Microsoft Graph service
 
-The Microsoft Graph .NET Client Library does not include any default authentication implementations.
-Instead, the user will want to authenticate with the library of their choice, or against the OAuth
-endpoint directly, and built-in **DelegateAuthenticationProvider** class to authenticate each request.
-For more information on `DelegateAuthenticationProvider`, see the [library overview](docs/overview.md)
+The Microsoft Graph .NET Client Library does not currently include any default authentication implementations.
+There are set of preview authentication providers available in the [msgraph-sdk-dotnet-auth](https://github.com/microsoftgraph/msgraph-sdk-dotnet-auth) repo.  Alternatively, you can use the built-in **DelegateAuthenticationProvider** class to authenticate each request.
+For more information on `DelegateAuthenticationProvider`, see the [library overview](docs/overview.md).  
 
-The recommended library for authenticating against AAD is [ADAL](https://github.com/AzureAD/azure-activedirectory-library-for-dotnet).
+The recommended library for authenticating against Microsoft Identity (Azure AD) is [MSAL](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet).
 
 For an example of authenticating a UWP app using the V2 Authentication Endpoint, see the [Microsoft Graph UWP Connect Library](https://github.com/OfficeDev/Microsoft-Graph-UWP-Connect-Library).