When I click an e-mail address in Adobe Reader X, an Outlook e-mail window opens, even though Thunderbird is my standard e-mail client and assigned to the mailto: protocol. How can I make Adobe Reader X open e-mail links in Thunderbird? I'm using Windows 7. How to Change the Email Client in Adobe Reader doesn't seem to apply to this version of Adobe Reader, I don't see the drop-down menu of step 6.