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 free PST viewer if you like, In case if your Outlook PST file size is large then, you also split it into multiple smaller parts via Shoviv PST Splitter Software. This software provide various splitting options such as Split by date, Split by year, Split by size, etc.