They didn't change much.
C:\Documents and Settings\YourName\Local Settings\Application Data\Microsoft\Outlook\backup.pst
That is the location of the file you need, it contains all of your folders. Here is how to copy it and then import it into the other computer...
Go to File, Import/Export and choose Export to a file then Personal Folder File (.pst). Choose your Personal Folders (by clicking it) and make sure to check Include Subfolders then hit Next. Choose Replace duplicates with items exported. You can now browse to the folder above and retrieve the file. You can burn it on CD or save to a disk do whatever you like. But be aware you will need to go to Tools, Folder Options, and go to the View tab. Then choose Show hidden folders and files (the Local Settings folder is hidden on default). Now you can enter that folder and find the Backup.pst file. Save it anyway you like.
As for importing, again go to File, Import/Export and this time choose Import from another program or file. Scroll down Personal Folder File (.pst) and navigate and find your file by clicking Browse to wherever you saved the file on the computer or from the cd you burned. Here it is up to you if you want to override all items with duplicates or merge data into your existing an existing mailbox by choosing Do not import duplicates. Hope this helps.
Good luck!