As if it wasn't enough for Yahoo to have withdrawn support for the HPC Yahoo IM client. They are now threatening to implement changes to the Yahoo IM Network that will effectively prevent people using third party clients (such as Trillian or imov Messenger) from logging in.

yahoo, like Microsoft are scaling down on their client support by insisting users upgrade to the latest client version. They are also taking the opportunity to implement new security into the IM network.