I need to process a number of messages in my Thunderbird.app (Mac OS X Snow Leopard, Intel Core 2 Duo), delete a few based on some criteria, export some others, move a small part of them to a special folder and create a filing hierarchy to go with it all - programmatically.
With Outlook I used to enjoy VBScript + the COM object model: it would do all of the above simply and intuitively.
What can I use to achieve the same with Thunderbird?
If multiple options are available, here are my current preferences in terms of languages (although I can adapt to most things): Python, C++, AppleScript, PHP, Perl, Bash, ...
If I need to move to a Windows box to use .NET and the like, I can (yet I'd imaging the most popular bindings come from the open-source world?!) If there was a command-line tool that did what I need, I'd use that! (thunderbird.sh show messages; thunderbird.sh create folder X as child of folder Y;)
Answer
You can develop Thunderbird extensions in a similar way to Firefox extensions in XUL and Javascript.
Try this tutorial.
This tutorial will introduce you to the components of a Thunderbird extension and will show you how to build your own.