GMailUI will add concepts inspired by GMail to Thunderbird,like archiving mail and powerful message searching across all folders.

Select a folder to be your sole 'archive' folder, or choose to have an archive folder in each of your multiple accounts. Then type 'Y' to send your selected message(s) to the appropriate archive folder. Type 'from:fred to:tom' to see all messages from Fred to Tom in the current view. Press Ctrl+Enter to have this search apply to all folders.

Requirements:

· Thunderbird: 0.8 – 2.0.0.*