Lately I have experienced trouble with receiving certain PDF files. (I say certain because it does not happen to all PDF files I have received). I can download and save them normally but they will not open and simply say they are corrupt and unrepairable. After some testing I pinpointed it to being an issue with Thunderbird as an e-mail with a pdf file could be opened on other e-mail accounts but the file still showed up as corrupt on thunderbird. Steps in which the issue occurs: > Receiving an e-mail with a PDF file > opening and/or saving the file Result: > Damaged/Corrupt file Expected result: > The correct and working PDF File.