old & new versions

"Britannica 2003 Ready Reference" uses JRE 1.3.X. After I downloaded JRE 1.5.0 _7 and keeping the 1.3, Britannica fails to open without any error message. Any solution to this predicament ?other than upgrading Britannica software, which I believe is EB's money-making scheme?
[283 byte] By [sunbuff577] at [2007-11-26 8:53:23]
# 1
Sorry, can't help you here. This forum is about Messaging Server, not about Java or JRE
jay_plesset at 2007-7-6 22:47:45 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Messaging Server...