BBAutoComplete 1.5, DropDMG 2.8.1, EagleFiler 1.2.6, and SpamSieve 2.6.4 have been tested with pre-release versions of Mac OS X 10.5, and there are no known incompatibilities. If you haven’t already updated to the latest versions of these applications, now is the time to do so. Any issues that arise with the final version of Leopard will be addressed with free updates as soon as possible.

If you are using SpamSieve with Apple Mail, you may find that the first time Mail launches it disables the SpamSieve bundle. Older versions of plug-ins can cause crashes or other problems, and Mail doesn’t know which are compatible so (as with Tiger) it plays it safe and disables them all. While the SpamSieve plug-in is disabled, Mail will move all incoming messages to the Spam mailbox. Since SpamSieve’s plug-in does work with the new version of Mail, all you need to do is re-install it. First, launch SpamSieve by double-clicking its icon in the Applications folder. Then, choose Install Apple Mail Plug-In from the SpamSieve menu. (If you’ve hidden SpamSieve’s Dock icon you’ll need to show it again in order to access this command.) After re-launching Mail, you can verify that the plug-in is loaded by checking for the SpamSieve commands in the Message menu.

Update (October 26): The help viewer may report an error when displaying the Apple Help under Leopard. As a workaround, you can view the PDF manual, which is also available in the Help menu. The content is the same. The Apple Help is also available on the Web.

Update (October 31): Make sure that you’ve named your spam mailbox “Spam” rather than “SPAM” or “spam”; otherwise training a message as spam might not work.

Update (November 2): Leopard has different performance characteristics than previous versions of Mac OS X, with some operations taking 10–50 times longer than before. For some users, this can make SpamSieve slow to launch (many bounces in the Dock) and slow to respond thereafter. Most users will not notice a difference, however. If you are affected, you can make SpamSieve much faster by pruning your corpus. Choose Show Corpus from the Filter menu, sort by Last Used, and delete the words that haven’t been used within the last year. I am working with Apple to find a better solution to this problem.

Update (November 14): BBAutoComplete 1.5.1, DropDMG 2.8.2, EagleFiler 1.2.7, and SpamSieve 2.6.5 include fixes for the Apple Help issue.

Update (January 23): SpamSieve 2.6.6 works around the Leopard performance bug so that it’s faster at launching and filtering messages.