Lync and Skype for Business clients may connect to Skype for Business Online, Exchange Online or both depending on where the account for these services are homed (online or on-premises). Lync/Skype client connectivity to Office 365 Now let’s discuss what each of these scenarios in a little more detail. 3rd party integration with Skype for Business Online.On-premises server integration w/Office 365.Lync/Skype client connectivity to Office 365.In order to best prepare for this upcoming TLS 1.2 change to your Office 365 environment, there are 3 scenarios that you should review and adequately plan and prepare for. However, TLS 1.2 will have to be enabled and used for communication with Office 365 to avoid any interruption in service. If parts of your environment require the use of TLS 1.0 and 1.1 on or after October 31, 2018, you can leave the older protocol versions enabled. Note: Using TLS 1.2 with Office 365 does not mean you must have TLS 1.0/1.1 disabled in your environments by October 31, 2018. This applies to both client-server and browser-server combinations.
These vulnerabilities can include (but are not limited to) Beast, POODLE, Crime and Heartbleed. However, Microsoft has stated due to the potential for future protocol downgrade attacks and other TLS vulnerabilities, they have made the executive decision to discontinue the support of TLS 1.0/1.1 in the Office 365 environment. So why are Microsoft pushing this so aggressively? Well as of right now, there are no known TLS 1.0 security vulnerabilities within Microsoft’s TLS 1.0 implementation. However, due to continuous backlash from the Microsoft community regarding the very aggressive timeline, Microsoft has agreed to extend support for TLS 1.0/1.1 until October 31, 2018. Initially Microsoft had said they’d no longer be supporting TLS1.0/1.1 as of March 2018. Microsoft has been toying with us in terms of their TLS 1.0/1.1 deprecation date. So, with all that said, let’s dive right in! Background So what does that mean and why should you care? In this article we’ll discuss what this means for users of Lync/Skype for Business on-premises and Skype for Business Online and why TLS 1.2 will be mandatory going forward in Office 365.
As you may have heard through the grape vine, TLS 1.0/1.1 will be deprecated starting October 31st, 2018.
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