I think it would be very useful to have an option to archive without the attachment. It would be incredibly cumbersome to have to forward myself the email without the attachment and then archive that one in order to keep the record of the chain. It would be great to archive without the attachment, because the attachment takes up too much space on my account, and I always just have the attachments downloaded to my computer anyway, so don't need the digital attachment floating around and taking up space on my account.