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Granting permission to all user calendars to a single user in Office 365

You need to give a single user access to all other user’s calendars in Office 365.


  1. Launch a PowerShell session and connect to Office 365
  2. If you’re going to be doing this for more than 1 user, you may want to get a list of calendars instead of calling the Get-Mailbox cmdlet everytime:
    $calendars = ( Get-Mailbox | ForEach-Object ( $a=$_.identity; $a+”:calendar”}
  3. You’ll need to use the Add-MailboxFolderPermission cmdlet to update the permissions. So, to give the user “test.user” rights to create events on everyone’s calendars:
    $calendars | ForEach-Object ( $a; Add-MailboxFolderPermission -Identity $a -User “test.user” -AccessRights PublishingAuthor)

A couple of notes about the last command there:

  1. If the user already has some permission to the target calendar, Add-MailboxFolderPermission will throw an exception rather than just update the permissions.  The loop above prints the name of the calendar before it attempts to add the permission so that I can tell which calendars failed and investigate why. You will either need to remove the existing permissions with the “Remove-MailboxFolderPermission” cmdlet or update them using the “Set-MailboxFolderPermission” cmdlet.
  2. There are several possible values for the -AccessRights switch;  run “Get-Help Add-MailboxFolderPermission -detailed” for a list.


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