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Re:Signal partners with Microsoft to bring end-to-end encryp... by sgtmas2006 on Thursday January 11, 2018 @02:45PM (#16127137)
It does give access to past messages.
Re:Signal partners with Microsoft to bring end-to-end encryp... by est on Thursday January 11, 2018 @08:33PM (#16129723)
Discord support chat history sever side searches, they even posted a blog about how to optimise ElasticSsearch clusters.

E2E encryption is useless here. Unless you setup some kind of dedicated channel for secretive group chats.

Re:Signal partners with Microsoft to bring end-to-end encryp... by Nuzzerino on Thursday January 11, 2018 @03:44PM (#16127657)
It is one of the permission settings that can be toggled for a Discord chat room.