CNet:
"Cerulean Studios has released new software patches that will allow its popular Trillian client to support MSN and Yahoo’s instant messaging services, according to its co-founder. […] Both Yahoo and MSN cited the need to improve security as the primary reason for the upgrades."
The "need to improve security" that everone knew was a laughable excuse when AOL evoked it years ago while Yahoo and MSN wanted to interop.