But metadata about connections is going to be stored on Microsoft servers, right? End-to-end crypto is good news, but metadata is still going to be stored in centralized services.
Thats great because we know we can trust Microsoft to implement the best security possible in their closed source application that noone can examine its code because Microsoft is the best most trustworthy people ever!!
Skype's End-to-End Encryption Goes Live August 20, 2018 https://www.bleepingcomputer.com/news/microsoft/skypes-end-to-end-encryption-goes-live/
So Microsoft and NSA are no longer buddies? https://www.theguardian.com/world/2013/jul/11/microsoft-nsa-collaboration-user-data