Clutter is a Microsoft Outlook feature that attempts to help you filter low-priority email, saving time for your most important messages. The email server keeps track of the email you read and the ones you don't. Clutter is automatic. As new email comes in, it takes messages you're most likely to ignore and puts them into the "Clutter" folder. The more you use it, the better it gets. And if you find Clutter isn't for you, you can turn it off.
If you wish to use Clutter it is important to check your Clutter folder often while it is learning what emails are likely to be less important. There is also an option to disable Clutter if you don’t wish to use it. More information, including how to train Clutter to make more appropriate choices or how to turn Clutter off, is available at https://support.office.com/en-in/article/Use-Clutter-to-sort-low-priority-messages-in-Outlook-2016-for-Windows-7b50c5db-7704-4e55-8a1b-dfc7bf1eafa0.
- If you are using Clutter you may want to add it to your Favorites in Outlook to help you remember to occasionally check it. Right-click on Clutter and select Show in Favorites. More information about Outlook Favorites is available at https://support.office.com/en-us/article/Add-or-remove-folders-in-Favorites-8913f2d0-b167-48cc-8983-86fa9b0d945f
- You can help Clutter learn your preferences. If you see a message that was sent to Clutter by mistake, right-click the message and choose Move to inbox, or drag the email from the Clutter folder and drop it in your Inbox. If you see a low priority email in your Inbox, right-click the message and choose Move to Clutter, or drag the email from your Inbox and drop it into the Clutter folder.
- Even if you have Clutter disabled Microsoft does not recommend deleting the Clutter folder. It may be automatically recreated and the Clutter features may be re-enabled.