We have just purchased NB4.5, and it came to use with FP3_GA. I have it installed in a primarily Windows environment with some IRIX and RedHat clients, and it seems to be running fine. I have been doing some research because i have been running into some issues like BackUps on certain machines stopping with a 150 error, that the job was stopped by and Administrator (wich is me). Does it make sence to upgrade to MP6? Is this a cumulative upgrade or do i need to upgrade in steps from FP3-MP6? Can i do an inplace upgrade, or do i have to uninstall NB and reinstall with the latest?