Migrate Distro List Members

Add-MemberToDistro.ps1

function Format-Name(){
    param($name)

    $array = $name -split ' '

    [pscustomobject]@{
        FirstName = $array[0].t
        LastName = $array[1]
        DisplayName = "$($array[1]), $($array[0])"
    }
}

function Find-User(){
    param($email)
    
    Get-ADObject -Filter {mail -eq $email} -Properties Displayname, mail, ExtensionAttribute14 |
    select Displayname, Mail, ExtensionAttribute14
}

function Compare-Users(){
    param($group, $members)

    $referenceObject = $($members | ForEach-Object { Format-Name $_ }).displayname
    $differenceObject = $(Get-DistributionGroupMember $group).displayname
    $diff = Compare-Object -ReferenceObject $referenceObject -DifferenceObject $differenceObject -SyncWindow ($referenceObject.length / 2)

    if($diff -ne $null) {
        Write-Warning "$group`: $(($diff | measure).count) differences"
        $diff | ft
    }
    else { Write-Warning "$group`: No Diff" }
}

#region - add users to groups
$unresolvedUsers = @()
$distros | ForEach-Object {
    $group = $_."Distro Email"

    if($_.'Member List'.trim() -ne ''){
        # get users to add to group
        $members = $_.'Member List' -split ';'

        # attempt to resolve a name to an email address
        $resolvedUsers = @()
        $members | ForEach-Object {
            $user = Find-User -email $_
        
            $count = $($user | Measure-Object).Count
            if($count -ne 1) {
                $unresolvedUsers += [pscustomobject]@{ name = $_; group = $group }
            }
            else { $resolvedUsers += $user.mail }
        }

        # add emails to group
        $resolvedUsers | ForEach-Object {
            try { Add-DistributionGroupMember -Identity $group -Member $_ -ErrorAction stop }
            catch { Write-Warning $_ }
        }
    }
}

#endregion