OWA: Problem with characters in message

Hello.

We have an Exhange 5.5 server. Some users are checking their mails via the outlook web access interface.

The problem we have is that if someone sends a message in Greek characters then the recipient gets the message in unreadable format (can not read the Greek letters).

This problems happens only in Outlook Web Access. For some reason Exchange OWA can not do the encoding in Greek.

Do you know of any patch that will add the Greek language functionality in Outlook Web Access 5.5?

Thank you in advance.