You may be interested in Microsoft's messaging protection solution, Forefront Online Protection for Exchange (FOPE), but you currently use another messaging-protection online service or a spam-protection appliance. The following TechNet topic, Switching to FOPE from Google Postini, the Barracuda Spam and Virus Firewall, or Cisco IronPort, starts at a high level and discusses the steps involved for switching to FOPE. Our hope is that it will help demystify the process for you.