Microsoft Exchange – Set address book policy based on group membership

$global:logPlace = "C:\ExchangeScripts\Automated\ExchangeService.log"

function Global-LogInfo ([string] $logFile, [string] $msg, [string] $color = "Blue", [string] $backgroundColor = "White", [boolean] $showOnly = $false) { 
   $timeFormat = "yyyy-MM-dd HH:mm:ss" # https://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx
   if ($showOnly -eq $true) {
        Write-Host "[$([datetime]::Now.ToString($timeFormat))]$msg" -ForegroundColor $color # -BackgroundColor $backgroundColor
   } else {
        Write-Host "[$([datetime]::Now.ToString($timeFormat))]$msg" -ForegroundColor $color # -BackgroundColor $backgroundColor
        if ($logFile -eq $null) {

        } else {
            Write-Output "[$([datetime]::Now.ToString($timeFormat))]$msg" | Out-File $logFile -Encoding utf8 -Append
        }
  }
}
function Get-GroupMembershipRecursive ($group) {
   $AllMembers = Get-ADGroupMember $group -Recursive | Get-ADUser -Properties DisplayName, Mail,msExchHomeServerName -ErrorAction SilentlyContinue | Select Name,msExchHomeServerName,ObjectClass,Mail, DisplayName
   Write-Output $AllMembers
}
function SetAddressBookPolicy ([string] $AddressBookPolicy, [string] $SetOnGroup, [Boolean] $debug = $false) {    
    $members = Get-GroupMembershipRecursive $SetOnGroup
    foreach ($member in $members) {
        #Global-LogInfo -logFile $global:logPlace -msg "[+] Information: $($member.Name) with email $($member.Mail) [+]"            
        if ($($member.Mail) -ne $null -and $($member.msExchHomeServerName) -ne $null) {
            $mailbox = Get-Mailbox $member.Mail | Select AddressBookPolicy 
            if ($($mailbox.AddressBookPolicy)-eq $AddressBookPolicy) {
                if ($debug -eq $true) {
                    Global-LogInfo -logFile $global:logPlace -msg "[+] Already set $AddressBookPolicy on $($member.Name) address. Skipping. [+]"
                }
            } else {
                
                Global-LogInfo -logFile $global:logPlace -msg "[+] Setting $AddressBookPolicy on $($member.Mail) address. Replaced address book policy: $($mailbox.AddressBookPolicy) [+]"               
                Set-Mailbox $member.Mail -AddressBookPolicy $AddressBookPolicy
            }
        } else {
            if ($debug -eq $true) {
                Global-LogInfo -logFile $global:logPlace -msg "[+] Skipping $AddressBookPolicy on $($member.Name) address. [+]"
            }
        }
    }

}

Get-GlobalAddressList | Update-GlobalAddressList
Get-AddressList | Update-AddressList
Get-OfflineAddressBook | Update-OfflineAddressBook