Microsoft is enabling the Office 365 Clutter feature for all UT accounts. Clutter is designed to move low-priority messages out of the inbox and into a Clutter folder, saving users time when scanning for important messages.
Clutter looks at how the user has handled similar message in the past to determine which messages are most likely to be ignored and then moves those messages to the Clutter folder. Users can quickly scan the folder and move any messages that shouldn’t be there back to the inbox. Clutter will learn from this and do better next time.
User will receive a summary message on days that Clutter finds a new or different message. This email is generated by Microsoft and is a legitimate message.