Hi
Came across your product while looking for a replacement for squirrelmail on OSX server. It was pretty easy to get working on OS X server 10.4.8 the only problems i had were getting MySQL working properly which is more an apple thing than anything else. I have roundcube deployed on 2 servers one is our production mail server and the other is a dev/test server where hopefully I can check out fixes, plugins etc.
I hate to pan squirrelmail because as a tool its very good, but roundcube just makes the whole thing a lot more fun, and its very light, the time to load is very good even over pretty slow links and even dialup. There are a few things I don't quite get yet but all in good time. Overall I'm very impressed and it makes a far nicer interface to a product like OS X Server. You guys should be hassling apple to include this as the webmail client of choice in OS X Server.
Keep up the good work
Jaspa