Microsoft Corporation has updated its 5.0 and 4.0 versions of Internet Explorer with new releases aimed at fixing bugs. First on the list is Internet Explorer 5.0, which has been updated to version 5.0a. IE 5.0a, which will also be included with Office 2000, primarily addresses Office 2000 integration problems. The new version number is 5.00.2314.1003 and currently there isn't any way to download an upgrade; rather you must currently download the entire set of files again. If you're running IE 5.0, this isn't a huge issue as any upgrades to Office 2000 will automatically install the new files. But anyone who downloads IE 5.0 from now on will get the 5.0a version.
Meanwhile, Internet Explorer 4.0 has been upgraded to Service Pack 2 (SP2). One can assume that this release includes recent security and bug fixes but I haven't seen any other information about it anywhere yet. If you're interested in downloading the latest version of IE 4.0, please visit the Microsoft Web site.
Thanks to Michael Tsang and Allen Harkleroad for tipping me off to these new releases