Hi Hitch,
Since posting the question I have discovered that only the Pro version allows Yahoo conferencing. I have also discovered that there is a common problem sending files through MSN on BOTH of the current versions. I have tried the Pro version
but for some reason it wouldn't allow me to add people to the conversation, on MSN, but the Free version does!
I have posted some comments on their support forums regarding these problems, as have hundreds of other people! To be honest I think they have a cheek asking people to pay for an 'upgraded' version, when the 'free' version doesn't yet function properly! Other than the file sending problem, I actually like Trillian, and it's handy to keep track of who's online in just the one window.
A great idea, but still need some work!