I have a strange situation where if I open a pst file on windows outlook, all the emails display correctly.

If I import the same pst file into mac 2011 or mac office365 then whilst all emails appear in the list i.e. email headers are correct, the body of some emails do not display correctly.  Most commonly the body is completely empty, or outlook seems to be attempting to display a html email body as plain text, but without the html tags displaying or being processed.  A fair bit of the text is lost as well.

All attachments show and work correctly.

Outlook 2011 and 365 display emails slightly differently but both are as good as useless.

Any ideas?

Thanks

Robert