To throw some more explanation (or confusion) into the discussion here, Microsoft also has several different definitions of MAPI. One version is known as Simple MAPI. This basically gives external applications a hook into e-mail programs to let do really basic operations, like compose and send an e-mail message. Many e-mail programs, including Outlook, Outlook Express, Thunderbird, and Eudora, support Simple MAPI. However, this is not what gets checked by EMON. Another definition of MAPI is a proprietary messaging system used by Microsoft Exchange. However, this is not what gets scanned by EMON, either. At least, not directly. Exchange mail does get scanned by EMON, but only at the e-mail client level, not at the data stream level. (see the next paragraph for more explanation) What does get scanned by EMON are messages in mail clients that make use of "Extended MAPI". Extended MAPI is kind of like Simple MAPI in that it gives external applications control over messaging, but much greater control. In addition to the ability to compose and send, Extended MAPI allows programs to edit messages, delete messages, move them to different folders, etc. E-mail clients that support Extended MAPI are Microsoft Outlook, and, ummm....., er......, Microsoft Outlook. Extended MAPI gives EMON the ability to scan individual e-mail messages in Outlook, and then modify or delete them as necessary. In other words, it allows NOD32 to act as an Outlook "plugin". Note that EMON gives NOD32 the ability to scan *any* sort of e-mail in Outlook. POP3, IMAP4, Hotmail, Exchange, whatever. As long as Outlook can handle it, EMON can scan it.