I came for an answer, and it is me who answers, haha, I didn't know how to autostart outlook 2003, now, thanks to you I know.
Now, well if you place a shortcut in the autostart folder, then, as long as it is a shortcut, you can right click it and choose properties, there you will find a tab named shortcut, there you find a run: type which is by default in normal window mode, you just change it to start minimized, and that's all, enjoy.