The last several versions' release notes have been riddled with derogatory "Mac OS X sucks" type comments. That's really obnoxious. Even though I've used this program since version 1.4, reading these release notes makes me want to jump ship for Mail or Entourage or something. Furthermore, I haven't seen any significant changes since version 4.0 (which really was ahead of its time). The biggest change I actually notice is that the splash screen is different, it can have ads, and now the "you have mail" and "you don't have mail" dialogs are ugly, black & white, and totally nonsensical. My biggest pet peve about this program is that it's NEVER supported Internet Config. I don't know if it would be appropriate in Mac OS X to support IC or Launch Services, but this kludgy custom resource mapping system that you have to use a resource editor to customize is totally lame. The address book has a lot of draw problems, at least in Mac OS X, and I wish they would offer support for the system Address Book. That's why I loved Eudora 3 and 4 so much, each one of them jumped on nifty new OS features (like Appearance Manager) before almost any other programs did. I'll probably keep using Eudora for awhile longer but if they don't have a major overhaul of the program relatively soon I'm going to stop using it.