Even though IBM now own Lotus, it's not IBM and it's not Lotus who won't do a Linux port of the Notes client. There's a third company owned (AFAIK) by Lotus who do all the development. They decided porting Domino to Linux was enough of an effort and refused to do a Linux port of the client. Besides, they wanted to push the web access to Domino.

Or at least that was the state of the nation 2 years ago when I was supporing Domino on Linux.

Wade.