Durning Summer 2015, Microsoft have introduced a feature called Clutter to Office365.  Clutter helps you move low priority messages out of your Inbox so that you can easily scan for important messages. Clutter analyzes your emails, and based on your past behavior, determines the messages that you’re most likely to ignore. It then moves those messages to a folder called Clutter so that you can review them later.

Note:  It is important to periodically review your Clutter folder to determine whether there are any items you deem important.  The Clutter system will send you weekly digest emails about what it is doing, and if it moves new types of messages you will get additional notifications.

Turn Clutter On of Off

Sign into Outlook Web App at

Select the Settings (Cog icon), Options, Mail, Automatic Processing, Clutter

Turn Clutter On: Choose Separate items identified as Clutter, then click save

Turn Clutter Off: Choose Don't separate items identified as Clutter, then click save.

You can only turn Clutter On or Off in Outlook Web App at present.  It will appear in Outlook 2016 for PC.

How to train Clutter

It might take Clutter a few days to fully adapt to your preference, as the system records your choices and uses the information to identify similar messages in the future. But you can help Clutter learn your choices faster:

If a message appears in the Clutter folder that really shouldn't, move the item back to your Inbox.  The Clutter systems will learn not to move similar messages to the Clutter folder automatically.

If a message appears in your Inbox that isn't important to you, move the item to the Clutter folder.  The Clutter system will learn to send similar messages to the Clutter folder automatically.

Clutter Weekly Digest

Clutter's weekly digest email looks like: