A reader asked if it’s possible to use PowerShell to return the unread count for the Inbox folder in user mailboxes. The standard Exchange Online PowerShell cmdlets tell you a lot about mailbox folder statistics, but they can’t look inside a folder. But the Microsoft Graph APIs can, so a combination of PowerShell and the Graph deliver a solution to the problem.
https://office365itpros.com/2022/05/19/mailbox-folder-statistics/
