User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.13) Gecko/2009073022 Firefox/3.0.13 (.NET CLR 3.5.30729) FBSMTWB Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.11) Gecko/20101013 Lightning/1.0b2 Thunderbird/3.1.5 I have a saved search folder that combines all my mail. I normally view mail sorted by date descending. I set <view <sort by <threaded to view threads. When you open a thread it is sorted opposite - ascending while the mail is sorted descending. Viewing sorted by date ascending sorts as you would expect. Reproducible: Always Steps to Reproduce: 1.Created a saved search folder. (it acts the same if you put the mail in a single folder) 2.set <view <sort by <threaded to view threads 3.view date descending Actual Results: When you open a thread it is sorted opposite - ascending while the mail is sorted descending. Viewing sorted by date ascending sorts as you would expect Expected Results: The thread should sort descending.

Bob, do you see your issue described in one of the bugs in thist list ? https://bugzilla.mozilla.org/buglist.cgi?type1-0-0=substring&short_desc=sort%20date&field0-0-0=short_desc&bug_severity=major&bug_severity=normal&bug_severity=minor&type0-0-1=substring&field0-0-1=keywords&type1-0-1=allwordssubstr&resolution=---&classification=Client%20Software&classification=Components&query_format=advanced&short_desc_type=allwordssubstr&type0-0-0=anywordssubstr&component=Folder%20and%20Message%20Lists&component=Mail%20Window%20Front%20End&field1-0-0=short_desc&product=MailNews%20Core&product=Thunderbird&field1-0-1=short_desc

Yes, It would appear that 479969 defines that same issue.

Thanks for tracking that down Bob. You're now an official bug triager! :)