Since my exit, stage left from VistaPrint earlier this year, I've been running my site at 1and1, with no real complaints, except that their VMs only offer Fedora Core 4, which is ages and ages old. I've been running UW-IMAP since then, and I've had some complaints. I believe those complaints might be client relate, but they might not, so I decided to try out some different servers. My only real complaint is that when running multiple clients against the same message store, they get out of sync.