This page lists the experiments that resulted from the notional architecture review.
Using the Salesforce.com AJAX toolkit in a Thunderbird extension
Determine a sensible approach for implementing a Thunderbird account
Determine a sensible approach for implementing a Thunderbird address book
Determine a sensible approach for implementing Thunderbird extension details, such as the "about" window
Determine a sensible approach for implementing a Thunderbird URL handler for Salesforce
Determine a sensible approach for implementing Thunderbird filters
Determine a sensible approach for implementing Thunderbird folders
Determine a sensible approach for implementing Thunderbird's offline mode
How does Thunderbird's undo/redo manager affect the offline cache?