If you have Tomcat and MailEnable Professional installed simultaneously on your server, it is a conflicting setup, because HTTPMail component of MailEnable Professional and Tomcat share the same port 8080.
Therefore, you must resolve the conflict manually. It is easier to change the port on the MailEnable Professional side. From the Start menu select the program shown below:

It will run MailEnable Professional management console. There, go to the properties editing dialog as shown on the picture below:

Change the value 8080 in the HTTPMail Port edit field to some other value in such way that it does not coincide with a port used by some other program. For example, change it to 8081.

After clicking the OK button follow the instructions on screen. After that, the conflict will be resolved.