on Vista SP2, Acrobat 9, Firefox as Standard-Browser and Thunderbird as Standard-Mail ("...has all standards...") Acrobat Readers opens a new Windows Mail when clicking on the Mail-Button in a PDF. This behaviour is new - some days before it was a new thunderbird mail - and i don't know how to reset this...
What to do?
it's not a AdobeReader-Problem - something was wrong with the thunderbird, which came by the integrated update. I downloaded it compledly and reinstalled it and adobe and all other Mailto-Links now open a new thunderbird mail.