If you use Office 365 for your email, you may have gotten a warning or have seen a folder appear called “Clutter.” Clutter is a fairly new feature from Microsoft for Outlook/O365 users that can help you filter low-priority email. Office 365 and Outlook keep track of the email you read and the ones you don’t. Once you turn it on, as new email comes in, Clutter takes messages you’re most likely to ignore and puts them into the “Clutter” folder. The more you use it, the better it gets.

Sounds nice, doesn’t it? That’s the theory. In practice, we’ve found it put stuff into our “Clutter” folder that we actually wanted to see, so we turned it off. You have to log into the Outlook Web App to turn it off. Here’s how you do it:

1. Sign in to the Outlook web app, usually via http://portal.microsoftonline.com with your full email address and password. Note: For many client’s we’ve migrated to Office 365, that username is your full email address and password is the same as the one you use to log into your computer (thanks to DirSync). For further help, see Microsoft’s support article.
2. At the top left corner of the page, select the App launcher icon, and then select Mail:
   
3. After loading your mail, on the top right corner of the page, go to Settings  > Options > Mail > Automatic processing > Clutter.
4. Choose Don’t separate items identified as Clutter, then Save 

You can turn Clutter back on anytime by selecting “Separate items identified as Clutter.”

Note: The Clutter folder remains in Outlook after you turn off the Clutter feature.

For more details on how clutter works and more tips for it, check out this Microsoft Support article.