So the old computer isn't usable? if you could open outlook 2007, you could export to a pst. Otherwise, try the steps at
https://support.microsoft.com/en-us/kb/872930#bookmark-8 using the ost copied from the old computer then export it. if that doesn't work, you would need to use recovery software. I have links to recovery software at
http://www.slipstick.com/problems/p...ange-offline-file-ost-to-a-personal-file-pst/.
BTW, one possible option if the hard drive is good but the motherboard is bad is to put the old drive in the new computer. If the old computer is really old, it probably doesn't have the same drive type as the new computer though. I don't know if you could clone the old drive (connect it to the new computer using a usb connector) to make a virtual drive to open in hyper v or VMware then export. (I know you can clone drives, but i'm not sure if they need to be the active drive. )