I've just installed Microsoft Explorer 5.2 Update for MacOS X 10.1.5 on my laptop.
I can now enjoy Quartz rendered fonts in my browser windows, a nice feature only available in Chimera until yesterday.
The other - questionable - feature of version 5.2 is to replace the current home page setting with msn.com. A visit to the Explorer / Preferences menu is mandatory to restore your previous home page (mine was Google).
What I would really like the Microsoft team to finally come up with is an XSLT engine, similar to the one in Internet Explorer 6 for Windows.
Mozilla vs 1.0 is supposed to have an XSLT engine already, but I haven't tested the MacOS X version yet.