Microsoft Identity Manager Skype for Business / Lync PowerShell Management Agent Export Script. Supporting blog post is located here https://blog.darrenjrobinson.com/provisioning-users-for-lync-skype-for-business-with-fim-mim-using-the-granfeldt-powershell-management-agent/

Export.ps1

param
(
	$username,
	$password,
	$ExportType 
)

begin
{
    $DebugFilePath = "C:\PROGRA~1\MICROS~4\2010\SYNCHR~1\EXTENS~2\Lync\Lync\DebugLyncMA.txt"

    if(!(Test-Path $DebugFilePath))
        {
            $DebugFile = New-Item -Path $DebugFilePath -ItemType File
        }
        else
        {
            $DebugFile = Get-Item -Path $DebugFilePath
        }
    
        "Starting Export : " + (Get-Date) | Out-File $DebugFile -Append


    # Registrar Pool
    $RegistrarPool = "Lync2013Pool.customer.com.au"

    # Setup Remote Powershell Session 
    $server = "https://servername/OcsPowerShell"
    $securestring = New-Object -TypeName System.Security.SecureString
    $password.ToCharArray() | ForEach-Object {$securestring.AppendChar($_)}
    $credential = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $username, $securestring
        	
  
   if (!(Get-Module -Name "Enable-CSUser"))
    {
	    Write-Debug "Opening a new RPS Session." | Out-File $DebugFile -Append
	    $skipCertificate = New-PSSessionOption -SkipCACheck -SkipCNCheck -SkipRevocationCheck
	    $session = New-PSSession -ConnectionUri $server -Credential $credential -SessionOption $skipCertificate -Name "Lync"
	    $global:session = $session
	    $lyncCommands = "Get-CsUser", "Get-CsAdUser", "Enable-CsUser", "Set-CSUser"
	   
	    Import-PSSession $global:session -CommandName $lyncCommands 
	    Write-Debug "Opened a new RPS Session." | Out-File $DebugFile -Append
    }

}

process
{
	$error.clear() 
	$_ | Out-File $DebugFile -Append
	$errorstatus = "success"
	$errordetails = ""

    	$Identifier = $_.Identifier
    	$objectGuid = $_.DN
		
    #Loop through changes and update parameters
    foreach ($can in $_.ChangedAttributeNames)
      {
        $can 
        foreach ($ValueChange in $_.AttributeChanges[$can].ValueChanges)
          {
            if ( $can -eq 'msDScloudextensionAttribute20' ){$cloudextAttr20 = $ValueChange.Value}
            Write-Output "extAttr20 val: $cloudextAttr20" 
          }
      }

    # Export uses Remote Powershell so we don't have to install the Lync commandlets on this MIM Server and keep them current.

   if ($_.ObjectModificationType -eq 'Add')
	{
    	# adds are caught by importing new objects from Active Directory (see import script)
	# and joining these to existing user objects on the metaverse
	throw "Add modification are not supported"
	}
	
    if ($_.ObjectModificationType -eq 'Delete')
	{
    	# deletes are caught by importing deleted objects (isDeleted) from Active 
	# Directory (see import script). This way we clear up the CS
	throw "Delete modification are not supported"
	}

    #Supported ChangeType is Replace
    if ($_.ObjectModificationType -match 'Replace')
	    {
		    $errorstatus = "success" 
		     # Lookup the object so we know it exists before we enable the user
        	    $curUser = New-Object System.DirectoryServices.DirectoryEntry "LDAP://<GUID=$objectGuid>", $username, $password 
		    if ( $curUser )
		        {
			        if (!$curUser.Properties["msRTCSIP-UserEnabled"])
	                       {
	                            # User isn't Lync enabled. Enable them 
			      	      enable-csuser -identity $objectGuid -sipaddresstype userprincipalname -registrarpool $registrarpool -ErrorAction "SilentlyContinue"
                         
	                         if ($cloudextAttr20)
	                            { 
	                                $curext20 = $curUser.properties["msds-cloudextensionattribute20"]
	                                if ($curext20)
	                                    {
	                                        # compare current val to new. Replace if diff
	                                        if (!($cloudextAttr20 = $curext20))
	                                            {
	                                              set-aduser -Identity $objectGuid -Replace @{'msds-cloudextensionattribute20' = $cloudextAttr20} -ErrorAction SilentlyContinue 
	                                            }
	                                    }
	                                else
	                                    {
	                                        #set value
	                                       set-aduser -Identity $objectGuid -Add @{'msds-cloudextensionattribute20' = $cloudextAttr20} -ErrorAction SilentlyContinue 
	                                    }
	                            }
	                          
	                       }
                    else
                        {
                            #user is enabled for Lync. Maybe the breadcrumb didn't get set
                          if ($cloudextAttr20)
                            { 
                                $curext20 = $curUser.properties["msds-cloudextensionattribute20"]
                                if ($curext20)
                                    {
                                        # compare current val to new. Replace if diff
                                        if (!($cloudextAttr20 = $curext20))
                                            {
                                              set-aduser -Identity $objectGuid -Replace @{'msds-cloudextensionattribute20' = $cloudextAttr20} -ErrorAction SilentlyContinue -ErrorVariable $errordetails 
                                            }
                                    }
                                else
                                    {
                                        #set value
                                       set-aduser -Identity $objectGuid -Add @{'msds-cloudextensionattribute20' = $cloudextAttr20} -ErrorAction SilentlyContinue -ErrorVariable $errordetails 
                                    }
                            }

                         }
	               
			}
		}	

    #Return the result to the MA
    $obj = @{}
    $obj.Add("[Identifier]",$Identifier)
    $obj.Add("[ErrorName]","success")
    if($errordetails){$obj.Add("[ErrorDetail]",$errordetails)}
    $obj
 }

end
{
	Remove-PSSession $global:session
}