Set Calendar permissions in Office365

You can add permissions on a specific mailbox, or you can add it onto a security group.

Step-by-step guide

1. Run Windows Powershell as Administrator
2. Login to Office365 with your admin account with command:  

   	$LiveCred = Get-Credential

   
   
   
   
   
   1. Import session for Office365 manage:

      	$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection

      
      
   2. Provide permissions:

      	Add-MailboxFolderPermission -Identity user1@domain.com:\calendar -user user2@domain.com -AccessRights Editor

      
      
      More information: http://theitbros.com/add-calendar-permissions-in-office-365-via-powershell/
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      The AccessRights parameter also specifies the permissions for the user with the following roles, which are a combination of the rights listed previously:
      
      
      • None – FolderVisible
      • Owner – CreateItems, ReadItems, CreateSubfolders, FolderOwner, FolderContact, FolderVisible, EditOwnedItems, EditAllItems, DeleteOwnedItems, DeleteAllItems
      • PublishingEditor – CreateItems, ReadItems, CreateSubfolders, FolderVisible, EditOwnedItems, EditAllItems, DeleteOwnedItems, DeleteAllItems
      • Editor – CreateItems, ReadItems, FolderVisible, EditOwnedItems, EditAllItems, DeleteOwnedItems, DeleteAllItems
      • PublishingAuthor – CreateItems, ReadItems, CreateSubfolders, FolderVisible, EditOwnedItems, DeleteOwnedItems
      • Author – CreateItems, ReadItems, FolderVisible, EditOwnedItems, DeleteOwnedItems
      • NonEditingAuthor – CreateItems, ReadItems, FolderVisible
      • Reviewer – ReadItems, FolderVisible
      • Contributor – CreateItems, FolderVisible