The Teams desktop and browser clients are gaining an offline send capability. Messages sent offline are queued locally and go when the network reappears. Connectivity must be resumed within 24 hours. If not, users need to review the messages to make sure that it still makes sense to resend them.
Microsoft Planner is able to work in offline mode when disconnected from the network. In this article, we describe what the browser client can and cannot do when it’s not connected. The thing is that Microsoft hasn’t told anyone that Planner can work offline. No blog, no documentation, and no Office 365 notification. Isn’t that strange?