Microsoft's upcoming Teams update, set for targeted releases in early November 2025 and worldwide by January 2026, will allow users to initiate chats with only an email address, even if the recipient isn't a Teams user. This feature raises security concerns among experts.
Microsoft won’t care and doesn’t need to care until businesses actually switch away.
And I hope they do.
Usually they get around this by offering controls for sysadmins at businesses to switch these sort of harebrained features off before they’re rolled out.