Outlook 2007 does not have a size limit for .pst files. How large is it? Do you get an error when you try to open it? You do not have to IMPORT it to view it in Outlook, you can go to file – open – outlook data file and open it on the folder list instead.You can also try pst viewer if you like, but Outlook should be able to open the file. Once you have it open you can also create a new pst file on your folder list and then move mail from the larger one to the new one by dragging and dropping.
Thanks & Regards