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Change priority of the received messages from the toolbar button and the context menus.
Notice that this extension changes priority in the *msf files. So, if you reconstruct the files, all changes will be gone.
* From 0.4.10, you can commit the change of priority to X-Priority. This rewrites original message so the change will not be gone if you commit. Moreover, you can share the changes on all environments if you use IMAP.
Please refer to the following link for supported locales:
If you use Thunderbird 1.5, download 0.1.50 from previous release page.