Yahoo! Groups is doing some house cleaning. As of next week we will start the process of deleting any group more than six month old that contains no messages, photos or files. By deleting these empty groups, we will help improve the performance and usefulness of group search.
If you have a specific group that currently has no content in it that you wish to save, you can avoid this deletion process by simply posting a message to the group, uploading a photo or file.