Weeks after the successful launch of its Firefox browser, <A HREF="http://news.zdnet.com/2100-3513_22-5473813.html?tag=zdnn.alert">Mozilla has released an email application</A> in another salvo on Microsoft's home turf. The Mozilla Foundation, an open-source development group founded by Netscape and spun off last year by Netscape's parent company, Time Warner, on Wednesday published a release candidate of its Thunderbird 1.0 email management software.