UPDATE: For he latest version. always go here.
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Version 1.04

Changes this release:

1. Improved Exchange compatibility
2. Less chatty in the console log
3. Improved handling of mail checks when you set mail to check "Manually".
   

To-do list:

1. Make a proper installer that doesn't require a user to type commands in Terminal.
2. Add a preference pane in Mail to enable or disable the plugin globally.
3. Add a preference pane in Mail to enable or disable the plugin by account.