Exchange 2019:- Find all mailboxes access rights
Ever wanted to quickly find all mailboxes and view the mailbox rights for each of those? Now you can with a PowerShell command that will show it to you.
Here is the command below:
ForEach($mailbox in (Get-Mailbox))
Get-MailboxFolderPermission -Identity “$($mailbox):\calendar” | fl Identity,AccessRights,FolderName
There you have the output, I only have 3 accounts but if you have more you can then you will have alot of scrolling or you can export the info to CSV.
Hope it helps.