Photos would close down on September 20, 2007, after which all photos would be deleted; users were encouraged to migrate to Flickr.[20] On January 31, 2007, Flickr announced that "Old Skool" members (those who had joined before the Yahoo! acquisition) would be required to associate their account with a Yahoo! identity by March 15, 2007 to continue using the service.[21] This move was criticized by some users.[22]