When I select “Attach to Email..” from the "File" Menu in Adobe Reader 9.4.1, I get the following message:
“Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.”
I am running Windows 7, 64-bit and my default email client is Microsoft Outlook 2010 64-bit. This problem has been discussed on many non-Adobe forums and the consensus opinion seems to be that, although Adobe Reader is compatible with Windows 7 64-bit, it still runs as a 32-bit program and that the email API requires either 64-bit->64-bit or 32-bit-> 32-bit but not 32-bit->64-bit calls. I don’t know if this has ever been confirmed by Adobe.
Regardless of the cause, when I attempt to use the email feature in a relatively standard configuration it simply does not work.
I guess Microsoft Office 2010 (x64) is not supported by Adobe Reader till yet. You can try to use either 32 bit office versions or other mail clients like Lotus Notes.