Exchange 2010 and Exchange2016 coexistence

超 邓 181 Reputation points

HI , engineer
During the coexistence of exchange 2010ru31 and exchange 2016 cu19, does exchange 2010 SP3 ru31 have to enable tls1.0-1.2?
If TLS encryption is not enabled, will outlook client agent affect it? Will mail flow have an impact?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Ashok M 6,506 Reputation points

    Hi @超 邓 ,

    Kindly refer the below guidance for TLS support in Windows/Exchange. Please note that TLS 1.0 & 1.1 has reached end of support.

    If there is any change or misconfiguration in TLS, then yes, there will be an mail flow/client connectivity issues.

    Also, kindly "accept as an answer" and close the below thread.

    If the above suggestion helps, please click on "Accept Answer" and upvote it.

    1 person found this answer helpful.

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  1. Kael Yao-MSFT 37,586 Reputation points Microsoft Vendor

    Hi, @超 邓

    Agree with Ashok, you may need to enable TLS on Exchange 2010.
    Otherwise, it would affect both client connection and mail flow between the servers.
    While if there aren't some clients which only support using TLS1.0 or TLS1.1 to connect, you only need to enable TLS1.2 and may disable TLS1.0 and TLS1.1 on the Exchange 2010 server.

    If the response is helpful, please click "Accept Answer" and upvote it.
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