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. Quarantined e-mails are stored in a separate SPAM folder. Users can manage their friends and enemies lists or build their own filters. The program has an option to test outgoing mail for potential risk of being filtered as spam. Recognition of newsgroup messages using Safe Recipients list and automatic inclusion of outgoing mail recipients into Friends List are available. POP3, IMAP, HTTP and MS Exchange support.