You'll need a utility to convert them if the profile that created the ost is
long gone.
See http://www.slipstick.com/problems/ost2pst.asp

--
Diane Poremsky [MVP - Outlook]
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Outlook & Exchange Solutions Center: http://www.slipstick.com/

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Poll: What version of Exchange server do you use?
http://forums.slipstick.com/showthread.php?t=33803

"Matt" wrote in message
...
I have my outlook contacts in a ost format and need to transfer them to an
ost format in order to open them in a new computer I have in outlook. I
no
longer have access to my old computer and only have the ost files on an
external hard drive.