Craig:

Two things I found elsewhere on the Web this morning:

1. An e-mail program is software in the user's computer that can access the mail servers in a local or remote network. Also known as an "e-mail client," "mail client," "mail program," and "mail reader," it provides the ability to send and receive e-mail messages and file attachments. E-mail capability is built into popular Web browsers such as Internet Explorer and Netscape Navigator. Stand-alone programs such as Outlook and Eudora are also popular. See POP3, IMAP and universal client.

2. A MAPI compliant mail client is a specialization of a mail client. Thus, a MAPI compliant mail client is also, by definition, a mail client. This may seem trivial to most people but it wasn't to me because I wanted a strict interpretation of the definition.

Conclusion: IE and Netscape are MAPI compliant mail clients.

Daniel