Ok, here is the situation. I have a MacBook at work, and a MacBook Pro at home. We just hired another employee and he is going to get my MacBook. I am going to move the data on my MacBook to my MacBook Pro and that will become my work machine. Eventually work will buy a replacement MacBook Pro for me (we are on a big contract right now but it will be a few months before we are paid). Here is what I want to do. I want to take the hard drive out of MacBook and put it in the MBP. Will this work? Or do I have to reinstall the OS with the version made for the MBP? Next I need to copy my data from one machine to another and finally put the original hard drive back in the MB and reformat it. (both machines have been upgraded to 500gb HD's). Are there any other problems I might run into? I hope I don't have to reformat when transitioning from MB to MBP, but it wouldn't be that bad if I did. Any thoughts?