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External HD for mac mini?

Scotty, Please tell me exactly what I need to do to copy her hard drive and set up her email (past emails, itunes, etc) and then get them active on her new computer. Thank you,

At startup on the new computer,you'll be prompted to transfer the data from another computer.  Choose to transfer data from another mac.  Next you'll be asked to put the other mac into target disk mode by holding down the T key while starting the older computer up.  After the new mac detects the older computer connected via a firewire cable, it will proceed to the next step.  In your case, you may need a firewire 400 to 800 cable unless the new laptop doesn't have firewire.  In that case you'll need to boot the older computer as usual then network the two computers via an ethernet cable.  This option is  selectable in the setup procedure on the new mac as "other computer over a network" or something close to that.  

You can always just set the computer up initially with a new user called "temporary" or something like that then use the migration assistant to move the data from one computer to the next by using an ethernet cable between the two.  Then delete the "temporary" user later.  

Helpful links:

Mac OS X 10.5, 10.6: How to use Migration Assistant to transfer files from another Mac

Mac OS X 10.3, 10.4: Transferring data with Setup Assistant / Migration Assistant FAQ
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