Nintendo announced that many of the online channels for the Wii will be discontinued on June 28, 2013. These channels include the Forecast Channel, News Channel, Everybody Votes Channel, Nintendo Channel and the Check Mii Out Channel.
WiiConnect 24’s data exchange between Wii friends will also be discontinued. This means that message exchanges on the Wii Message Board, Mii exchanges on the Mii Channel, and data/message exchange in some game titles will no longer be possible.
Source: Nintendo.com