I recently switched one of my machines to Ubuntu 7.10 64-bit edition. We use GroupWise for email and calendaring, and Ive never had anything but brutal performance out of Evolution in my GroupWise account so I decided I wanted to use the real GroupWise client.
Read it here
To get it working on 64-bit Ubuntu took a few steps. First, I needed a deb package, and GroupWise comes as an rpm, so I installed alien which is a utility that can convert between package formats.