I have been having a problem with Firefox and AOL.com when it comes to attaching .pdf files. It seems to only affect .pdf files when using AOL.com. I get the following error message: "The message was not sent because of an error." It also doesn't allow me to save that particular message as a draft. I can upload other file types, granted I haven't tried to upload every single type of file type, but I was successfully able to attach the following file types: .doc; .docx; .xls; .jpg; .txt. If I try attaching a .pdf file with any of the other file types that it usually sends, I get the same error message and am not able to send the e-mail. I can send .pdf files from AOL.com when I use Internet Explorer with no problems. Additionally, I have no problems attaching and sending .pdf files using gmail in Firefox. I also noticed that the same thing happens when I try to send a .pdf attachment using Yahoo.com, but like with AOL.com, I am able to send other file types using Yahoo.com. I tried starting Firefox in "Safe Mode" with the Add-ons disabled, but the problem was still there. This has been going on for a few months, with the various update versions of Firefox. I have tried this on my home and work wifi networks with the same results. I use the AOL account for work, so I don't use it all that often, which is why I thought that it was a temporary glitch, but I think that it is more than just a temporary glitch. Also, I tried various PDF files of different sizes and from different locations, with long and short file names, but all had the same result. Interestingly, if I remove the .pdf extension from a PDF file, or change the .pdf extension to a .doc extension, it lets me send the files. I did try this on another computer that is running Windows XP with the same version of Firefox and I was able to attach and send a PDF file using AOL.com. I don't know if it is a problem isolated to my computer, or if it is something with Windows 7, but I wanted to mention that as well. I would appreciate any help/guidance in this situation. I can still send the files using Internet Explorer, so it's not the end of the world, but if anyone has any solutions, I would greatly appreciate it. Thank you very much. Take Care, -David