(There's no video for Internet Explorer 5.5b1 Macintosh Edition Preview yet. Please contribute to MR and add a video now!)
The version number "5.5" attached to this beta is highly misleading. At the time of release, June 2000, the current version of Explorer for Mac OS Classic was 5.0. When stable releases resumed, they were numbered 5.1 (December 2001) through 5.1.7 (July 2003). Because there never was an official IE 5.5 for Mac, this beta gets mistaken for the state of the art, when it's actually three years behind.
There do not seem to be any major issues with this unofficial beta release. It is OK. Not as full featured (compared to Classilla or WaMCom Mozilla on Mac OS 8.6/9.x), but runs well enough.
(7.92 MiB / 8.3 MB)
/ compressed w/ Stuffit
If installing on Mac OS's pre 8.6 and you find it crashes on 1st run. Try installing the included "Microsoft Internet First Run" app manually (double-click and install this 1st), it's located inside of the "Microsoft Internet Self-Repair" folder. I found this helped in getting IE 5.5 to run happily on earlier systems.
Emulating this? It could probably run under: SheepShaver