Multi-window chat is in testing. I hope to have great news regarding rollout to the public rings soon.
We are working to ensure that multi-window and other future multi-window experiences are of the highest quality when they release.
198 votes32 comments · Public » Apps, Connectors, Messaging Extensions · Flag idea as inappropriate… · Admin →Olivier Bloch commented
Curious to know where this one is at? Much needed feature to me!