Hi,
Clutter is a feature in Office 365 designed to help users focus on the most important messages in their Inbox by moving lower priority messages into a new Clutter folder.
If you don't want to disable the Clutter folder, please do the following settings to turn Clutter off:
1. Sign in to Outlook Web App. For help, see
Sign in to Outlook Web App.
2. At the top left corner of the page, select the App launcher icon, and then select Mail.
3. 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 .
Note: The Clutter folder remains in Outlook after you turn off the Clutter feature.
https://support.office.com/en-us/article/Use-Clutter-to-sort-low-priority-messages-in-Outlook-2016-for-Windows-7b50c5db-7704-4e55-8a1b-dfc7bf1eafa0
As for Unwanted folder in Outlook, please confirm if there is any third-party ActiveSync Devices such as Android, Samsung Galaxy added for your email account. If that is the case, please disable the SPAM filter on Phone completely to confirm if the
Unwanted folder still works or not.
Regards,
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Winnie Liang
TechNet Community Support
