OK, Rephrasing the Questions - Something New

[Simon Bowring]

>The best portable GUI library is without doubt Java's world class
>Swing library, which has *no peers* as regards portability, 
>"controllability", elegance of design and implementation, "power", 
>and cost (it also has pretty good run-time performance), but you 
>pay the very heavy memory resource usage and slow load time penalties 
>that Java introduces.

Of course, you could implement a core mail library in C/C++
and the GUI in Java, Tcl, python or whatever.

Simon