Export-MultiUsers.ps1

Param (
    [Parameter(ValueFromPipeline)]
    [string]$User
)

Begin {
    $Path = "c:\scripts\UserArchive.CSV"
}

Process {
    Get-ADUser $User -Properties MemberOf,Description,Organization,Manager,Mail,LastLogonDate | 
            Select Surname,GivenName,Name,Title,Description,Mail,Organization,@{Name="Manager";Expression={ (Get-ADUser $_.Manager).Name }},LastLogonDate,@{Name="Groups";Expression={ ($_.MemberOf | ForEach { (Get-ADGroup $_).Name }) -join ", " }} |
            Export-CSV $Path -Append -NoTypeInformation
}