Summary: Mail repeatedly crashes soon after launch. It pinwheels for a few seconds, and then it quits. This happened three times in a row. Disabling the ToDoPlugIn.bundle stopped the crashes from occurring. Steps to Reproduce: 1. Launch Mail.app. 2. Wait a few minutes. Expected Results: Mail doesn't crash. Actual Results: Mail crashes. Regression: I updated (combo updater) from 10.5.5 to 10.5.6 yesterday. I never experienced the crashes before today. 21-Dec-2008 06:42 AM Jeff Johnson: Mail crashed again this morning. The ToDoPlugIn is still off, so that apparently doesn't solve the crashes, though it's not repeatedly crashing this morning like it did yesterday. 24-Dec-2008 06:59 AM Jeff Johnson: If you have a workaround that doesn't involve deleting all my data, I'd love to hear it, because I continue to experience these crashes every day, sometimes multiple times a day. 06-Jan-2009 10:39 AM Jeff Johnson: To update, it seems that I have fixed the crashes. Mail was continuing to crash soon after launch every day multiple times a day, with the same crash trace -[MetadataManager getAllCalendarStoreData]. I noticed in the crash logs that there were a number of calls to the IMAPAccount class, which is strange, because I have no active IMAP account. I did, however, have an old, inactive IMAP account for a previous job. I decided to delete all of my old, inactive accounts (the one IMAP and a couple of POP), and Mail has never crashed since I deleted those inactive accounts. Now, I'm seeing a new, empty folder in my Mail folders list, "ToDos.mbox (Karppinen)". Karpinnen was the name of the inactive IMAP account that I deleted. Thus, it seems pretty clear that that inactive IMAP account was somehow the reason behind the crashes. This account was created (and also made inactive) in Tiger, before ToDo support was ever added to Mail. Is it safe to delete the "ToDos.mbox (Karpinnen)" folder? I assume that it is, but I thought I'd ask.