User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:188.8.131.52) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729) Build Identifier: Mozilla Thunderbird Version 3.0.1 When I open my Thunderbird browser in the AM and routinely keep it open during the day the message folders that I seperate my mail out in are continuously saying that I have #(all messages in folder) as unread. I believe it is a filter problem but it my filters are exactly the same as they where on previous versions of Thunderbird. Reproducible: Sometimes Steps to Reproduce: 1. Create multiple Filters 2. Get new mail sorted automatically by filters 3. Watch as all previous message in folder appear to no longer be read. 4. Happens in Sent box as well.
you're probably using an imap server that supports condstore - 3.02 will have a fix for this - 3.02 pre builds are here - http://ftp.mozilla.org/pub/mozilla.org/thunderbird/nightly/latest-comm-1.9.1/