This is interesting! Fonts do temporarily appear better when following your instructions! I'm still not sure if they appear as sharp as they do on Chrome or Firefox, but still better. I agree you 're on to something.
I don't know how can we point this any more to Microsoft. Let's hope they will pay attention and release an update - possibly including it within the Windows 8.1 or "blue" update rumored for this summer.
I have found some things that at least help with this problem until MS (maybe) decides to fix it. The first (and most helpful) thing is to make sure that you have all common "web fonts" installed. Windows includes most of them by default, but there are some Mac fonts that are used commonly around the web. Fonts I have found to be helpful are:
- Helvetica (the most common Mac and Adobe core font)
- Lucida Grande (the Mac UI font)
- Helvetica Neue (the default iOS font)
- Roboto (Google's newer Android font)
- Droid (Google's original Android font)
With these installed, Facebook shows HUGE improvement (it uses Lucida Grande) and Yahoo looks better (it uses Helvetica). I'm sure there are other major sites I will notice over time.
Finding fonts online is sometimes in a "gray area" depending on your local laws, so I will leave the searching up to you. The following website lists most of the common "web fonts" but it excludes the mobile device ones I listed above:
http://www.seoconsultants.com/fonts/web/
If you have all of these plus Helvetica Neue, Roboto, and Droid you should be in pretty good shape. Once you have found and downloaded your fonts, follow these instructions to install them:
http://www.groovypost.com/howto/install-fonts-microsoft-windows-8/
Hopefully this at least helps a little bit. At least Facebook is looking A LOT better for me.