I just received the following email from Apple: I'll be the first to admit that I've been aware that this was only a Beta from the start. However, I'd hoped that the finished product would be available for Lion, even if for a small fee ($0.99-$2.99?). Sorry to hear that's not the case, apparently. Yes, I plan to eventually upgrade to Mountain Lion, but I was not prepared to do so in the next month. That's not my point. I'm frustrated that Apple continues to follow this policy of withholding features to existing hardware/software setups that are perfectly capable of handling them (both on OS X and iOS). Messages has been working quite well for me on my Mac... Why disconnect it? On the flip side, perhaps there are new features coming to Messages that just won't work with Lion. Maybe there's a good reason behind this.