Exchange Powershell command to see who has my calendar in their outlook?

Is there an Exchange Powershell Command to see who has my Calendar visible in their Outlook?

I Migrated my user account to O365 and the users that are still On-Premise are getting a Message saying they need to quit and restart outlook.
I wanted to send just those people an email about the dialog vs everyone in the company.
Scott TownsendIT DirectorAsked:
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J SSenior Systems AdministratorCommented:
I'm not aware of a command that will allow you to see whom actually has the calendar linked in outlook.  I would dump the permissions of the user's calendar and email the users whom have access.

Get-MailboxFolderPermission -Identity “\Calendar”
Scott TownsendIT DirectorAuthor Commented:
Bummer. Everyone has access, though not everyone has my Calendar Mounted.
Todd NelsonSystems EngineerCommented:
You can always modify the permissions. Personally, I would remove what is currently set and then add only the users I want to provide access.

Remove-MailboxFolderPermission "YourMailboxAlias:\calendar" -User UserToRemove
Add-MailboxFolderPermission "YourMailboxAlias:\calendar" -User UserToAdd -AccessRights Reviewer

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Scott TownsendIT DirectorAuthor Commented:
Everyone in the Company can See Everyone's Calendar. We all have Review permissions so we can schedule appointments with each other. There are some groups that are more specific/limited, though they are limited by a Distribution list, not everyone in the DL actually mounts everyone's calendar vs just see the Free/Busy when Scheduling an Appointment.   So far the Error was seen by people that actually mount my Calendar in their outlook.

I'll Just send a message to Everyone, as it will apply to other people once I start Migrating them to O365 too.

Todd NelsonSystems EngineerCommented:
This is a common and expected occurrence when mailboxes are both on premises and in EXO.  Unfortunately, because you say that everyone has access to everyone's calendars, that message will be a nuisance until all mailboxes are in EXO.
Todd NelsonSystems EngineerCommented:
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