I sent an e-mail with an attachment (it happened to be a copy of a folder)
to a friend. Both computers are running XP.

When the friend got the e-mail, there was a banner across the opened e-mail
stating: OWE has removed access to the following insecure attachments your
mail: (list followed.)

First question - how does my friend prevent this unequivocal removal (no
choice given about deciding whether he WANTED the attachment removed)?

Second question - how do I send this attachment and prevent it being labeled
'insecure'?