User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_5_4; en-us) AppleWebKit/525.18 (KHTML, like Gecko) Version/3.1.2 Safari/525.20.1 Build Identifier: version 184.108.40.206 (20080421) Thunderbird's sort arrow direction is reversed from that of other programs, such as Apple Mail. "Down" does not sort entries by latest-to-earliest order; it goes the opposite. This is strictly a UI guideline error, but other programs follow the Apple Mail example, which makes sense in this case. Reproducible: Always Steps to Reproduce: 1. Click on Date column so that display sort arrow is facing "DOWN" 2. Email entries will be sorted in earliest-to-latest order, being reversed. 3. Actual Results: Mail that was received earliest appears at the top of the list Expected Results: Mail that was received later should be at the top of the list In programs that use the UP/DOWN arrows as sorting indicators, DOWN always means "latest-to-earliest"