Really? Since when?

http://www.joelonsoftware.com/items/2006/09/01.html: "FogBugz is written in Wasabi, a very advanced, functional-programming dialect of Basic"

http://www.joelonsoftware.com/items/2006/09/01b.html: "And since FogBugz goes back many years and was originally written in VBScript, Wasabi is 100% backwards-compatible with VBScript." (granted, VB != VBScript)

http://fogcreek.com/Jobs/Dev.html: "Today we happen to use Wasabi, JavaScript, xhtml and CSS, and C++ to build FogBugz"