The ability for a Teams user to contriol the notifications they see for channel conversations is being expanded with a new option to mute specific conversations. This is useful when you’ve contributed to a conversation that becomes very chatty and floods your activity feed with updates. Direct @mentions and reactions to your replies still get notified even when a conversation is muted.
You can configure Send As and Send on Behalf of permissions to allow Exchange Online users to send messages for an Office 365 Group. All is well if the messages arrive, but if they don’t, the NDRs might not get to where you think they should go, such as a folder in the Recoverable Items structure. That’s OK if the sender was told that a problem exists with a message, but they don’t know anything happened.
Office 365 makes extensive use of Azure Active Directory guest accounts. Implementing a risky sign-in policy is a good idea, but it can have the unfortunate side-effect of suddenly blocking guest accounts that could previously access tenant resources. If blocks happen, they can only be lifted through administrative intervention in the guest account’s home tenant.
The Office 365 E5 plan includes Advanced Threat Protection (ATP), which builds on the anti-malware capabilities of Exchange Online Protection. ATP the includes Safe Attachments and Safe Links features, both of which can delay email delivery. I don’t notice the delay but others do. In any case, the more protection you have against malware, the better.
Microsoft Teams now supports the ability for users to pin their most important channels to the top of the teams list in the desktop and browser clients. Pinning channels is a good way of tracking what’s happening in critical channels, especially when you belong to some chatty channels whose conversations might swamp your activity feed.