Sometimes delegate access for an Exchange Online calendar goes awry due to corrupted items in the mailbox. To help sort out problems, Microsoft has upgraded the Remove-MailboxFolderPermission cmdlet to do the work that used to be done by a multi-phase fix performed using the MFCMAPI or EWS editor utilities. The nice thing is that this method is quick, simple, and works well.
In addition to mailbox permissions, Exchange Online supports folder-level delegated permissions. Users can create folder delegations through Outlook desktop. Like mailbox permissions, it’s a good idea for tenants to check folder-level delegations to ensure that people don’t keep permissions for longer than they should. We explain how to create a PowerShell script to generate such a report.