Exchange remove auto mapping mailboxes for user

exchange-remove-auto-mapping.ps1

# Set the user to fix
$user = "DOMAIN\UserName"

# Reapply FullAccess with AutoMapping disabled on every mailbox where the user currently has FullAccess
Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails UserMailbox,SharedMailbox,RoomMailbox,EquipmentMailbox |
Where-Object {
    Get-MailboxPermission -Identity $_.Identity -User $user -ErrorAction SilentlyContinue |
    Where-Object { $_.AccessRights -contains "FullAccess" -and -not $_.IsInherited }
} | ForEach-Object {
    Remove-MailboxPermission -Identity $_.Identity -User $user -AccessRights FullAccess -Confirm:$false
    Add-MailboxPermission    -Identity $_.Identity -User $user -AccessRights FullAccess -AutoMapping:$false
}