I just used MailMessager in two different ways:
1. I unpacked the setup and started the JAR to setup MailMessager first account, restarted the JAR to get it to work
2. I used the setup executable to install MailMessager, started via the shortcut, restarted after the account setup
In both times error log files are created reflecting an error with the tray icon on Win7 Prof 64bit SP1.
I attached the error log files and the settings file with an erased account user name and password.