Powershell find calendar permissions
Find out who has access to Office 365 calendar permissions using Powershell
$mbx = Get-Mailbox -Resultsize Unlimited
ForEach ($mbx in Get-Mailbox) {Get-MailboxFolderPermission ($mbx.Name + ":\Calendar") | Where-Object {$_.User -like <string>} | Select @{Name="Calendar Of";expression={($mbx.name)}},User,AccessRights}