Set Default Calendar Sharing Permissions for all users
- Open Notepad
- Copy the following cmdlets and edit as required:

3. Save the file as a PowerShell Script file.
4. Open Windows PowerShell
5. Run your script file
6. Enter your Office 365 admin credentials and click ok
Access Rights Roles
Author
CreateItems, DeleteOwnedItems, EditOwnedItems, FolderVisible, ReadItems
Contributor
CreateItems, FolderVisible
Editor
CreateItems, DeleteAllItems, DeleteOwnedItems, EditAllItems, EditOwnedItems, FolderVisible, ReadItems
None
FolderVisible
NonEditingAuthor
CreateItems, FolderVisible, ReadItems
Owner
CreateItems, CreateSubfolders, DeleteAllItems, DeleteOwnedItems, EditAllItems, EditOwnedItems, FolderContact, FolderOwner, FolderVisible, ReadItems
PublishingEditor
CreateItems, CreateSubfolders, DeleteAllItems, DeleteOwnedItems, EditAllItems, EditOwnedItems, FolderVisible, ReadItems
PublishingAuthor
CreateItems, CreateSubfolders, DeleteOwnedItems, EditOwnedItems, FolderVisible, ReadItems
Reviewer
FolderVisible, ReadItems
The following roles apply specifically to calendar folders:
AvailabilityOnly
View only availability data
LimitedDetails
View availability data with subject and location
Access Rights Permissions
CreateItems
The user can create items in the specified folder.
CreateSubfolders
The user can create subfolders in the specified folder.
DeleteAllItems
The user can delete all items in the specified folder.
DeleteOwnedItems
The user can only delete items that they created from the specified folder.
EditAllItems
The user can edit all items in the specified folder.
EditOwnedItems
The user can only edit items that they created in the specified folder.
FolderContact
The user is the contact for the specified public folder.
FolderOwner
The user is the owner of the specified folder. The user can view the folder, move the move the folder, and create subfolders. The user can’t read items, edit items, delete items, or create items.
FolderVisible
The user can view the specified folder, but can’t read or edit items within the specified public folder.
ReadItems
The user can read items within the specified folder.
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