I received an email from yahoo that contained the following
I thought I'd pass it along to anyone.
- Message Attachments: Yahoo! Groups will continue to deliver all
attachments sent via email, however, the attachments will no longer be
archived within the Messages area. You may continue to upload files
and images to the Files and Photos areas of your groups. Please
re-upload any attachments you would like to preserve to the Photos or
Files areas of your group. On Aug. 7, all attachments in the Messages
area will be removed, and Yahoo! will be unable to retrieve such data.