User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727) Build Identifier: Thunderbird 2.0 I set several filter roles and build some folders in my account. But sometimes, after I moved some mails from inbox to another folders manually, they are going to disppear. I have lost lots of mail cause this bug. Would you find out what happened and help me to find these mail back. Thanks. Reproducible: Sometimes Steps to Reproduce: 1.build a new folder 2.mark some mails and tug them into the new folder 3.the mails are going to disppear