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Exchange Online and Exchange Server 2019 Security, Client Access Rule.
This video will give an overview of the use case of Client Access Rule and how it add more security when it comes to managing your tenant in O365 and Exchange 2019.
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Microsoft Technet url
Client Access Rule in Exchange Online
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/client-access-rules/client-access-rules
Client Access Rule in Exchange 2019
https://docs.microsoft.com/en-us/exchange/clients/client-access-rules/client-access-rules?view=exchserver-2019&viewFallbackFrom=exchserver-2016
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Exchange 2019 installation
https://youtu.be/ed_1LAJWNHs