With the following powershell commands you can easily set and modify Office 365 calendar permission, you will need to enter the command in order:

1. $Cred = Get-Credential (Login as your Office 365 admin account when prompted)

2. $s = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $cred -Authentication Basic –AllowRedirection

3 .Import-PSSession $s

4. add-MailboxFolderPermission -Identity *account to change permissions on*:\Calendar -User *account to give permissions to* -AccessRights PublishingEditor

Here you can see the permission levels which can be set:

Permission Level Definition
OwnerCreate, read, modify, and delete all items and files, and create sub-folders. As the folder owner, you can change the permission levels others have for the folder. (Does not apply to delegates.)
NoneYou have no permission. You cant open the folder.
ContributorCreate items and files only. The contents of the folder do not appear. (Does not apply to delegates.)
Reviewer:Read items and files only.
Non-Editing AuthorFull read details. Create items. Delete own items. Folder visible.
Publishing EditorCreate, read, modify, and delete all items and files, and create sub-folders. (Does not apply to delegates.)
EditorCreate, read, modify, and delete all items and files.
Publishing AuthorCreate and read items and files, create sub-folders, and modify and delete items and files you create. (Does not apply to delegates.)
AuthorCreate and read items and files, and modify and delete items and files you create.
CustomPerform activities defined by the folder owner. (Does not apply to delegates.)

 

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