FIX: POP3 and IMAP4 are not supported to use TLS protocol 1.1 or 1.2 in Exchange Server 2013

Applies to: Exchange Server 2013 Service Pack 1Exchange Server 2013 Enterprise


In a Microsoft Exchange Server 2013 environment, POP3 and IMAP4 are not supported to use Transport Layer Security (TLS) protocol 1.1 or 1.2.


By design, POP3 and IMAP4 in Exchange Server 2013 support only earlier versions of TLS, including TLS protocol 1.0.


To fix this issue, install Cumulative Update 11 for Exchange Server 2013.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


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