Enable "Appear Offline" in Microsoft Lync

Enable-AppearOffline.ps1

$ErrorActionPreference = 'Stop'

try {

    $LyncPolicyKey = 'HKLM:\Software\Policies\Microsoft\Communicator'

    if (!(Test-Path $LyncPolicyKey)) {
        New-Item $LyncPolicyKey
    }

    Set-ItemProperty $LyncPolicyKey EnableAppearOffline -Value 1

}
catch {
    Write-Warning "Could not set the appropriate registry keys. Be sure PowerShell is running as an administrator."
}