Editing Calendar Permissions in Office365 via Powershell

First you need to connect to Office365.

Next, simply run this commandlet:
Add-MailboxFolderPermission calendar@company.com:\Calendar User guy@company.com AccessRights Author

Your accessrights options are: Owner, PublishingEditor, Editor, PublishingAuthor, Author, NonEditingAuthor, Reviewer, Contributor, AvailabilityOnly, LimitedDetails

If you’d like to get permissions, you can simply use:
Get-MailboxFolderPermission Identity calendar@company.com:\Calendar User guy@company.com

Finally, to remove permissions:

RemoveMailboxFolderPermission Identity calendar@company:\calendar user dude@company.com

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