My Outlook 2003 data was taken off the server at my former office and placed in an .ost file on my thumbdrive. Now I cannot reload it on the same computer/same program at my new office because it needs to be a .pst file. Is there a way to send the .ost file to someone who has the conversion software to convert it and send back to me the .pst files?

How did they take the information off the server?

I am assuming that you were on a Exchange Server? If they exported the information, it would be in a pst file, not ost. You can't export the information to an ost file.