So, now I got most of my software installed. Entourage is working and syncronizing against the company Exchange server and I got most of my files transferred, so everyting seem fine...
... but then I rebooted the computer and just after the finder is up and running, the MacBook completely locks up. I can't even Ctrl+Eject or anything. Nothing to do. Tried to reboot in all different ways Apple's support page suggested and I even reset the RAM etc.
Only one thing to do - reinstall the OS X!!!
The difference between a Windows XP and OS X - OS X has greater colors when the computer completely locks up!!!
Did I make the wrong choice by doing the switch - the next weeks will show, but for now it doesn't look great.