Crashes ever since latest software update

Question

Ever since I downloaded and installed the latest Apple software updates to my computer (Mac OS X 10.4.9 if I remember correctly, and whatever are the most recent updates to iTunes, QuickTime, and Backup), I've been unable to open Mail. Every time I try to launch it, it crashes and gives me the message "The application Mail quit unexpectedly." The only things I've changed in my computer since the last time I was able to use Mail have been those software updates. Has anyone else had this problem? Can anyone suggest ways I can fix it?

Answer 1

Problems arising right after installing a system update are usually the result of some filesystem corruption that should have been fixed first, or not having installed the update properly (e.g. applications running while installing it), or having ignored Apple’s “Important: Please read before installing” warnings, etc.
Verify/repair the startup disk (not just permissions), as described here:
The Repair functions of Disk Utility: what's it all about?
After having fixed all the filesystem issues, if any, reinstall the update using the combo installer:
About the Mac OS X 10.4.9 Combo Update
Mac OS X 10.4.9 Combo Update for PowerPC
Mac OS X 10.4.9 Combo Update for Intel
After installing the Combo Update, the computer may restart twice and the first restart may take several minutes. This is normal.
Take a look at the following articles for guidelines on how to properly install system updates:
Troubleshooting installation and software updates
Installing software updates
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The above may or may not solve the problem, but will allow us to at least troubleshoot it properly. Post back with your observations when done. In particular, does Mail crash immediately or when it starts to download messages.
If Mail crashes immediately upon start up, the cause could be a troublesome message that Mail tries to load every time you open it. Try launching Mail holding the Shift key down until the main window appears. This tells Mail to not select any mailboxes or load any messages upon start up.
If Mail crashes when it starts to download new mail, try the following to check whether the junk filter could have a bearing on it and post back with your observations:
1. Either tell Mail to go offline immediately after opening it, or shut down your Internet connection and open Mail afterwards.
2. Go to Preferences > Junk Mail and disable junk mail filtering.
3. Go online again.