After a clean install of Lion, everything is fine, except Apple Lion Mail takes often 1 minute to shut down while the activity panel states "Removing message attachment". This happens each time, even when there have been no new incoming emails with attachments. Any ideas why this "Removing message attachment" and 1 minute shutdown is occurring. Could this problem be because, when I copied the Mail folder from Snow Leopard, I also copied the Mail Downloads folder? I use Lion Mail with Gmail IMAP. As background, when exporting emails from Snow Leopard to Lion, I copied the Mail, and Mail Downloads folders, and the preference file. These emails in Snow Leopard were smooth as silk.