Libraries in common, server and webapps

Hi, Why mail.jar is installed in server/lib and in common/lib ? Can we remove the common/mail.jar ? We noticed some problems between classes in directory common and directory of applications For example, commons-logging-api.jar is in common. An application needs an other version of

Source of tomcat.exe

We use tomcat (4.1 and 5.5) on windows as services. Is someone knows where we can find the source in C of these executables ? Thanks