Yoshito,

 

I'm maintaining a mapping data between the IANA tzids and Windows time zones in the Unicode CLDR project and review the data about quarterly basis [http://www.unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml].

I'd say you're doing an awesome work!

Do you think I could use your work to improve libical regarding to timezone information?

We are using libical in Evolution (and its friends) and, in evolution-ews, would be nice if we can have this mapping working properly.

Another question is ... do you think cldr could replace libical? This is the first time I heard about the project