They're saying that they'll release an update to AcroPro 7.0.9 "at a later date." I guess it's easy to see where the priorities lie. There is, of course, a workaround: go around to all of your affected PCs & apply a registry patch. Yeah.

"In the meantime, IT administrators may choose to disable the mailto: option in Acrobat, Acrobat 3D and Adobe Reader by changing the application options in the Windows registry."