MailNavigator is a combination of two advanced tools for fast handling of e-mails and news messages: Navigator - is a very convenient mail and news browser, featuring some unique capabilities. Filter - is a powerful information retrieval tool for the mailbox folders of the majority of popular mail programs: MS Mail, MS News, MS Outlook, Outlook Express, Netscape Messenger, Eudora, Forte Agent, Pegasus Mail, The Bat, Eserv, and also for all the popular bases of the Fidonet information network. The processing language of the filters includes the standard operators: OR, AND, NOT, NEAR, their synonyms, and parentheses for defining the order of operators.