BACKGROUND
We are planning to discontinue support for 3DES in O365 Skype for Business starting on July 10, 2019. Please refer to the following O365 Encryption guidance for 3DES retirement preparation - https://docs.microsoft.com/en-us/office365/securitycompliance/technical-reference-details-about-encr...
HOW TO PREPARE
The following Office 365 Skype for Business clients and devices rely on 3DES and therefore must be updated or replaced:
To prepare your organization for the client connectivity scenarios, you should ensure that your clients meet the following minimum versions:
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