After installing the latest security update, several apple apps decided to crash at starting them up (Mail, Addressbook, Printer utility etc. etc.). You can solve this problem by 1. create a new admin user (e.g. Second admin) check the box where u can administer the computer. 2. Download the OS X 10.4.11 update, place it in the Apps folder (don't place it in a user specific folder, your'e going need it!) 3. Restart and log in as Second admin. 4. Repair permissions 5. reinstall the OS X 10.4.11 Updatepackage 6. restart and log in with your usal login name / Password Then everything should work again as usual. hope this helps Cheerio