functions/contacts/Get-EXCContacts.ps1

function Get-EXCContacts
{
<#
    .SYNOPSIS
        Gets a Contact in a Contact folder in a Mailbox using the Exchange Web Services API
     
    .DESCRIPTION
        Gets a Contact in a Contact folder in a Mailbox using the Exchange Web Services API
         
        Requires the EWS Managed API from https://www.microsoft.com/en-us/download/details.aspx?id=42951
     
    .PARAMETER MailboxName
        A description of the MailboxName parameter.
     
    .PARAMETER Credentials
        A description of the Credentials parameter.
     
    .PARAMETER Folder
        A description of the Folder parameter.
     
    .PARAMETER useImpersonation
        A description of the useImpersonation parameter.
     
    .EXAMPLE
        Example 1 To get a Contact from a Mailbox's default contacts folder
        Get-EXCContacts -MailboxName mailbox@domain.com
         
    .EXAMPLE
        Example 2 To get all the Contacts from subfolder of the Mailbox's default contacts folder
        Get-EXCContacts -MailboxName mailbox@domain.com -Folder \Contact\test
#>

    [CmdletBinding()]
    param (
        [Parameter(Position = 0, Mandatory = $true)]
        [string]
        $MailboxName,
        
        [Parameter(Position = 1, Mandatory = $false)]
        [System.Management.Automation.PSCredential]
        $Credentials,
        
        [Parameter(Position = 2, Mandatory = $false)]
        [string]
        $Folder,

        [Parameter(Position = 3, Mandatory = $false)]
        [string]
        $RootFolderName,

        [Parameter(Position = 4, Mandatory = $false)]
        [switch]
        $useImpersonation,

        [Parameter(Position = 5, Mandatory = $false)]
        [switch]
        $ForExportToVcf,

        [Parameter(Position = 6, Mandatory = $False)]
        [switch]
        $ModernAuth,
        
        [Parameter(Position = 7, Mandatory = $False)]
        [String]
        $ClientId
    )
    Process
    {
        #Connect
        $service = Connect-EXCExchange -MailboxName $MailboxName -Credential $Credentials -ModernAuth:$ModernAuth.IsPresent -ClientId $ClientId 
        if ($useImpersonation)
        {
            $service.ImpersonatedUserId = new-object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $MailboxName)
        }
        $folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Contacts, $MailboxName)
        if ($Folder)
        {
            $Contacts = Get-EXCContactFolder -Service $service -FolderPath $Folder -SmptAddress $MailboxName
        }
        else
        {
            if(![String]::IsNullOrEmpty($RootFolderName)){
                $folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Root,$MailboxName)   
                $rfRootFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)  
                $fvFolderView = new-object Microsoft.Exchange.WebServices.Data.FolderView(1) 
                $SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::DisplayName,$RootFolderName) 
                $findFolderResults = $service.FindFolders($rfRootFolder.Id,$SfSearchFilter,$fvFolderView) 
                if($findFolderResults.Folders.Count -eq 1){
                    $Contacts = $findFolderResults.Folders[0]
                }else{
                    throw "No Folder found"
                }
            }else{
                $Contacts = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service, $folderid)
            }
        }
        if ($service.URL)
        {
            $SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.ItemSchema]::ItemClass, "IPM.Contact")
            #Define ItemView to retrive just 1000 Items
            $ivItemView = New-Object Microsoft.Exchange.WebServices.Data.ItemView(1000)
            if($ForExportToVcf.IsPresent){
                $ivItemView = New-Object Microsoft.Exchange.WebServices.Data.ItemView(100)
            }
            $fiItems = $null
            do
            {
                $fiItems = $service.FindItems($Contacts.Id, $SfSearchFilter, $ivItemView)
                Write-Verbose("Retrieved " + $fiItems.Items.Count + " of " + $fiItems.TotalCount + " OffSet " + $ivItemView.Offset)
                if ($fiItems.Items.Count -gt 0)
                {
                    $psPropset = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)
                    $psPropset.RequestedBodyType = [Microsoft.Exchange.WebServices.Data.BodyType]::Text
                    if($ForExportToVcf.IsPresent){
                        $psPropset.Add([Microsoft.Exchange.WebServices.Data.ItemSchema]::MimeContent);
                    }
                    [Void]$service.LoadPropertiesForItems($fiItems, $psPropset)
                    foreach ($Item in $fiItems.Items)
                    {
                        Write-Output $Item
                    }
                }
                $ivItemView.Offset += $fiItems.Items.Count
            }
            while ($fiItems.MoreAvailable -eq $true)
            
        }
    }
}