My os is xp. After installing Reader 9, I cannot open pdf attahement to incoming email. The error message is "the file does not have a program associated with it", even though I have already associated pdf with Reader 9 in Folder Option. If I save the pdf attachement to a different folder I am able to open it.
Maybe I need to rever to Reader 8. If someone cannot solve the error message, maybe can tell me where I can get Reader 8 as it is not in the Adobe free download.
I have no problem opening PDF attachments that arrive in my Outlook 2003 Inbox; they open fine with Adobe Reader 9. It may be an issue with your email client.
But if you think that Adobe Reader 8 will fix it, you can download it from http://download.adobe.com/pub/adobe/reader/win/8.x/8.1.3/enu/AdbeRdr813_en_US.exe - make sure that you uninstall Reader 9 first (and Acrobat.com & Adobe AIR).