Comment on Mail.appetizer

Tips from the web :

A workaround was posted to the Mail.appetizer mailing list to use it under 10.5 :

1. Ensure that Mail.app is not running.

2. Launch Terminal and enter these two commands:

defaults write com.apple.mail EnableBundles 1
defaults write com.apple.mail BundleCompatibilityVersion 3

3. Move the Mail.appetizer bundle from the folder ~/Library/Mail/Bundles (Disabled) back to ~/Library/Mail/Bundles.

4. Launch Mail.app -- all should be well again.

Don't work for me, have you try this ?