Warning: ignoring a portion of document that users a feature from another version of Notes

If the user attaches an MSOffice document into a Notes mail from his local hard drive, he or a receiver cannot open the mail, and the error in the subject header is given. But when he attaches the same file from the Novell network server file system into a mail, the mail can be opened.

This is somewhat mad.

Does anyone have any ideas?

Cheers.