Where are iCal, Mail, Address Book, etc. files????

If we reinstall the OS because of major problems, but the drive files are backed up, can we retrieve Mail, Address Book, iCal, etc. files? Our office assistant is tearing her hair out having to re-do everything. Supposedly it's backed up, but she can't find it...or how to RECOVER her missing data.


It was "solved" by someone else, who just dragged the files over. We've had nothing but trouble with the machine ever since. I will repost updating with the new problems....