I upgraded from freeware version to Plus or Pro, or, I moved my Plus or Pro from Windows 98 to NT/XP/2K/2003server, and mail server tray icon disappeared. Where did it go?
A There is no tray icon, because it is no longer needed. Now your server runs as a service. It runs on the background, even when nobody is logged in, and even when controller application (application, represented as an icon on your desktop, or start menu) is not running. You do not have to run controller application all the time, it should be used only when you need to look how your server is doing, or make some changes. Service itself is a separate module, which always runs. Even more, it is better not to run the controller application, because when it is running, service module tries to communicate with it, and it increases the load. Try to keep it closed, unless you really need it. But, if you still want to have tray icon, and do not care whether your server runs as a normal application, or as a service, you can select to install Windows 98 version, when running server installer.