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MAPILab Ltd. pleased to announce the article "Microsoft Outlook 2003 Spam Filter: Under the hood". This article describes in details how the built-in Microsoft Outlook 2003 junk mail filter based on "state-of-the-art technology developed by Microsoft Research" works. This article point to critical holes of Microsoft technology and will very useful to technical specialists and non-technical readers who interested in spam protection technologies. Software developers will find a couple of exercises we've prepared for them to check if they have learnt to detect junk mail with up-to-six-decimal-digits accuracy, as the filter does. Table of contents: Introduction General information about the filter OUTLFLTR.DAT file format Data file contents State-of-the-art technology Message sending time check Check of the message subject for words in uppercase Check of the sign number in the message subject Check of duplicate character number The rest eight checks Exercises for developers Under the hood Appendix A. OUTFLTR.DAT file dump Appendix B. Useful web links Full version of the article is available in Internet here: http://www.mapilab.com/articles/outlook_sp...pam_filter.html Reprint of this article with the reference to MAPILab is free. You may use any information from this article, quote this article, and reproduce it in any fragment or entirely, both for non-profit-making purpose and to derive benefit. MAPILab doesn't demand any pecuniary recompense for usage of this article.