Outlook doesn't recognise imported Contact's language

A friend has a laptop, W7 Home Premium with Office 2007. Both English versions.

She is trying to import her Outlook Contacts from an XP Pro SP3/Office 2003
Pro Greek system.

The new system won't recognise the Greek characters when importing the PST ,
although it is possible to manually add Contacts in Greek.

Installing the Office 2007 Greek Language pack doesn't help.

So there is a ridiculous situation whereby she has a Office with all menus
etc in Greek, she can manually add Contacts in Greek, but she can't import
the 600 odd
contacts from her old system.

Advice please.