I have the 10.5.5 version of MAc OS and I want to know what advantages I would get from the upgrade of parallels desktop from 5582 to the build 5608? thanks
No that it is not necessary. Parallels remembers the current state of windows when you are closing the virtual machine. So in the following when you are opening the virtual machine it continues windows exactly in the state you have left, even with the programs you left open etc.