User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.5) Gecko/20031007 Firebird/0.7 Build Identifier: Thunderbird 1.0 Productversion 1.7.5: 2004122606 just do as follow: type a new filter, based on searching in the bodies of mail the string: .exe it works fine. Close Reopen Thunderbird, Close Reopen... it wil work fine until the end of time. Now do the following, cancel every filter (or take a brand new machine and install thunderbird). just do as follow: type a new filter, based on searching in the bodies of mail the string: .exe" See the double-quote, it is not written anywhere it is forbidden to use it, the filter is made, just close the windows one by one, till you close thunderbird, take a break, reopen thunderbird, reopen the filters, your filter is still here, but inside the filter, there is no rule anymore, thunderbird just remember the actions to perform, but has eaten the rule itself, because of the double-quote. Reproducible: Always Steps to Reproduce: 1. type a new filter, based on searching in the bodies of mail the string: .exe" See the double-quote, it is not written anywhere it is forbidden to use it the filter is made, save it. 2. just close the windows one by one, till you close thunderbird, 3. take a break (not important) 4. reopen thunderbird, 5. reopen the filters, your filter is still here, but inside the filter, there is no rule anymore, thunderbird just remember the actions to perform, but has eaten the rule itself, because of the double-quote. Actual Results: Can't use the filter has i would like to. A lot of work to create lots of filters and if one have a double quote, it is done for nothing, if you put more than once double-quotes, it can do funny thing when the filter is written on file and more funny when the file is read and interpreted to the filter windows Expected Results: the rule imagined and typed for searching a string should not disappear, if some ascii characters can not be used, forbid it with an alert when user is typing. the rule should have been in front of me when reopennig thunderbird, and if so i am sure it would have worked... Filters are the reason why, someone use software that are pretty big, i have software of 450KB working fine, but i have to put in directories myself and cannot automate it. So it is a major function and thus a major severity issue.

*** This bug has been marked as a duplicate of 103658 ***