I am using an HP LaserJet 1536 dnf MFP. Up to the last three weeks I cannot get the scan document from hp scanner to drop into my email client (Thunderbird). Instead I get error message to use Outlook. Prior to the last three weeks everything was working normally. I would scan a document and direct it to my email client and it would show up as an attachment to my email. I made sure that the windows software default setting for email was set to Thunderbird which it was. By the way I am using Windows version 8.1. I called and spent hours with HP Tech Support and they cannot discover a fix to this problem. They said to call Thunderbird Tech Support. any help would be most appreciated.