After understanding what is Office 365 Clutter , we are going to illustrate how can you enable or disable Clutter for Office 365 user or all users

You have to know that this can be done through PowerShell

Connect to Office 365 using PowerShell

To enable clutter for one user run:

Set-Clutter -Identity user@domain.com -Enable $true

To disable clutter for one user run:

Set-Clutter -Identity user@domain.com -Enable $false

To enable clutter for all users run:

Get-Mailbox | Set-Clutter -Enable $true

To disable clutter for all users run:

Get-Mailbox | Set-Clutter -Enable $false

How to find out who has clutter enabled or disabled

You can use the script attached here to Export all Office 365 users Clutter status to a CSV file

This PowerShell script connects to Office 365 and lists out all mailboxes and shows you if each user has Clutter enabled or disabled for their mailbox.

Sources: Cogmotive Blogs