Now that we have official Domino support for CentOS I would expect everyone who needs a free server OS to look into CentOS. Still -- I got the second person in two weeks looking into Domino on Ubuntu.

In the last couple of month we have been working on performance bottlenecks for customers with higher latency network connections between Traveler and the back-end mail-servers. It took a while until we got all the fixes implemented after very detailed analysis (for example I wrote an extension manager to track object reads).