In 2004, in response to Google's release of Gmail, Yahoo! upgraded the storage of all free Yahoo! Mail accounts from 4 MB to 1 GB, and all Yahoo! Mail Plus accounts to 2 GB. On July 9, 2004, Yahoo! acquired e-mail provider Oddpost to add an Ajax interface to Yahoo! Mail Beta. Google also released Google Talk, a voice over IP and Yahoo Messenger and Yahoo message boards service, on August 24, 2005. On October 13, 2005, Yahoo! and Microsoft announced that Yahoo! and MSN Messenger would become interoperable. In 2007, Yahoo! took out the storage meters, thus allowing users unlimited storage.