An adeptation of the script by Matthias R Jessen.
# Get all mailboxes in the forest
$Mailboxes = Get-User -OrganizationalUnit "Employees" | Get-Mailbox -ResultSize unlimited -IgnoreDefaultScope
$ConfirmPreference = "None"
# Iterate over each mailbox
foreach($Mailbox in $Mailboxes)
{
try
{
# Try to run the example fix against the current $Mailbox
$FixAutoMapping = Get-MailboxPermission $Mailbox |where {$_.AccessRights -eq "FullAccess" -and $_.IsInherited -eq $false}
$FixAutoMapping | Remove-MailboxPermission -Confirm $false
$FixAutoMapping | ForEach {Add-MailboxPermission -Identity $_.Identity -User $_.User -AccessRights:FullAccess -AutoMapping $false}
}
catch
{
# Inform about the error if unsuccessful
Write-Host "Encountered error: $($Error[0].Exception) on mailbox $($Mailbox.DisplayName)" -ForegroundColor Red
}
}
This still cycle through all inboxes in the “Employee” UO and remove all AutoMapping from those shares. Please note that I disabled confirmation of privilege changes on the Remove-MailboxPermissions.