Outlook Spam Filter is an easy-to-use MS Outlook add-on that protects your Inbox against spam. The program is based on Bayesian filtering technology. It automatically learns using your personal correspondence to increase the filtration accuracy. Caught spam is placed in a special 'Spam' folder under your inbox if you ever want to review it later.

Outlook Spam Filter allows you to manage your friends and enemies lists, build your own filters, or set it to block any messages written in non-English character set. The program has an option to test outgoing mail for potential risk of being filtered as spam. It will review your message and return a grade along with the reasoning behind it.

Recognition of newsgroup messages using Safe Recipients list and automatic inclusion of outgoing mail recipients into Friends List are available. Outlook Spam Filter works with all mail accounts supported by Outlook: POP3, IMAP, HTTP and MS Exchange.