Blank from, to and subject fields, formatting missing

Hello,

Over the last 48 hours most of my emails viewed in Outlook Express are not showing a "From", "To" or "Subject" and the content is in a text format including lots of codes (more than just html) - MIME?? They are not just spam mails but ones from known contacts. On web mail the formatting is all correct. Mails to other email accounts that use Outlook Express (but different set-up - IMAP vs POP3) are all fine.

My partner who uses the same PC with Outlook Express and BT Yahoo has had the same problem too.

Does anyone have an thoughts please?

Thanks,

James