2.1.7 [RFC3501] Section 11.1, Client MUST Implement the TLS_RSA_WITH_RC4_128_MD5 Cipher Suite

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The specification states that the client MUST implement the TLS_RSA_WITH_RC4_128_MD5 cipher suite.

Outlook does not implement the TLS_RSA_WITH_RC4_128_MD5 cipher suite and, instead, relies on the operating system to provide the implementation.