Outlook Express does not have pst files. Outlook (part of Office)does.
If it is pst files from Outlook then you might want to try to export the
pst files from Outlook and THEN import to Vista Mail....
OR
You cannot import into WinMail from a PST file unless Outlook is installed
and using that as its default.
The easiest war is to import into Outlook Express 5 or 6 on the old machine
and then follow the instructions here:
backup