New inv2.20.x: Support for PGP 8 keys, ESMTP support, message export (as RTF, DOC, etc.), improved printing options, major rewrites of the code, various bug fixes; Notes
New: Web-based search results page, file exporting capabilities, IE 4.0 integration, more -->
Pros: Great filtering technology, easy to use interface, advanced configuration options
Cons: HTML formatting needs work, no IMAP support, pricier than some mail clients, no major updates in several years
