I have tried this one a bunch of times now.What is my problem! Seems I just don't learn. In th past it caused Mail.app to behave erratically and then to crash. Now, Mail app will run for a while, but MailTags forces Apples's buggiest application to launch at the same time — the dreaded iCal, which causes the mail startup process to take what seems like forever. Messing with settings has no effect on this lovely experience. And if you want to have a good laugh, just try using the included MailTags Uninstaller to get rid of this buggy thing. It won't. You are stuck with it no matter how many times you run the Uninstaller and reboot your machine. Nice. Now you have to manually hunt down whatever files this nefarious little bugger installed that are gumming up the works. I'm on a G5 2ghz dual running 10.4.10. Hardly an exotic configuration. Does anyone actually test this thing before distribution?