Outlook 2003 can't import pst ; no "Import" command on File menu

I upgraded from MS Outlook 2000 to 2003 and suffered freeze-up because of
large pst file (2003 less tolerant than 2000). I split my PST file to allow
Outlook to open and converted to unicode to allow for larger file size.
I want to transfer incorporate my old mail non-unicode PST file (Outlook
2003). However, when I click on Files on the toolbar, the menu has no
Import/Export command.
Is this because I changed to Unicode? If so, how do I solve? If not, what
can I do?

Spailpin