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Exchange 2010:  Set Calendar Permissions to everybody using Powershell

Posted on 2015-02-05
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Last Modified: 2015-02-05
The management wants to have one set of permissions on everybodys Outlook calendar.  The permissions have to look like this for everyone:

KK-Exchange-Permissions.jpg
How can I do this?
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Question by:whenz
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This should do it:

$Mailboxes = Get-Mailbox -ResultSize Unlimited

ForEach ($Mailbox in $Mailboxes) {
   Remove-MailboxFolderPermission -Identity ($Mailbox.sAMAccountName+':\Calendar’) -User Default -ErrorAction SilentlyContinue
   Remove-MailboxFolderPermission -Identity ($Mailbox.sAMAccountName+':\Calendar’) -User "Z-Verteiler GL" -ErrorAction SilentlyContinue

   Add-MailboxFolderPermission -Identity ($Mailbox.sAMAccountName+':\Calendar’) -User Default -AccessRights AvailabilityOnly
   Add-MailboxFolderPermission -Identity ($Mailbox.sAMAccountName+':\Calendar’) -User "Z-Verteiler GL" -AccessRights Author

   Set-MailboxFolderPermission -Identity ($Mailbox.sAMAccountName+':\Calendar’) -User Anonymous -AccessRights None
}

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The reason we don't remove the Anonymous permissions is simply because you can't - Exchange doesn't allow you to remove the Anonymous user through PowerShell (at least my environment wouldn't).
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