Every content item in this list is tagged with all the required labels:

• busy
• coa
• courses
• custom-mail-flow-rule
• email-access
• manage-participants
• migrations
• ms
• muting
• office365
• retired
• sign-out

To add a label to the list of required labels, choose '+ labelname' from Related Labels.
To remove a label from the required labels, choose '- labelname' from above.