Get all Groups list along with members csv export

 $Result=@()

$groups = Get-DistributionGroup -ResultSize Unlimited

$totalmbx = $groups.Count

$i = 1

$groups | ForEach-Object {

Write-Progress -activity "Processing $_.DisplayName" -status "$i out of $totalmbx completed"

$group = $_

Get-DistributionGroupMember -Identity $group.Name -ResultSize Unlimited | ForEach-Object {

$member = $_

$Result += New-Object PSObject -property @{

GroupName = $group.DisplayName

Member = $member.Name

 EmailAddress = $member.PrimarySMTPAddress

 RecipientType= $member.RecipientType

 }}

$i++

}

$Result | Export-CSV "C:\\All-Distribution-Group-Members.csv" -NoTypeInformation -Encoding UTF8