Microsoft has spent several years working on antispam technology, and beginning in 2003, we finally started seeing some results, including a new spam filter that debuted in the company's MSN Hotmail and MSN 8 mail servers. In late 2003, Microsoft added this technology, dubbed SmartScreen Technology, to its Microsoft Office Outlook 2003 email and personal information manager (PIM) client. The company also announced plans to make the technology available to certain Microsoft Exchange Server 2003 customers through a new add-on called the Exchange Intelligent Message Filter. Here's what you need to know about SmartScreen Technology and the Exchange Intelligent Message Filter.