Web site subscription capabilities, improved Active Desktop...
New inv4.01 SP2: All security patches and bug fixes from SP1 plus five new security patches ("Window.External JScript", "Cross Frame Navigate", "Dotless IP Address", "Untrusted Scripted Paste", and "Frame Spoof" patches) and a variety of fixes for support issues (including fixes for the secure lock sign disappearing while connected to a secure page, the left-most part of the status bar not being wide enough, the interface language defaulting to English in country-specific locales, and an inability to install Internet Explorer 4.01 from CD after a failed download/setup); Release Notes Upgrade Meter: 2
New in v4.01/4.01 SP-1: Improved Active Desktop and Active Channels systems, Web site subscription capabilities, general bug fixes and security patches; Release Notes Upgrade Meter: 4
Pros: Extremely quick, excellent mail client and newsreader, Active Desktop, freeware
Cons: IE 5/6+ raise the browser bar and, to a very large degree, make IE 4.0 obsolete; discontinued and no longer supported by Microsoft