Preparing for TLS 1.0/1.1 Deprecation - O365 Skype for Business

wroot, as per https://support.microsoft.com/en-us/help/4057306/preparing-for-tls-1-2-in-office-365 :

• If you have Windows 7 clients connected to Office 365, make sure that TLS 1.2 is the default secure protocols in WinHTTP in Windows. For more information see KB 3140245.

So yes, there's something to be done in Windows 7, explained here https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in

I believe Internet explorer 11 manually establishes the highest version of TLS as default (that's just my belief, have not contrast that yet), and as stated in the article "This update will not change the behavior of applications that are manually setting the secure protocols instead of pass the default flag." Referring with the default flag to WINHTTP_OPTION_SECURE_PROTOCOLS, for the  DefaultSecureProtocols registry entry.