Sounded like standard bland pr-speak to me. They didn't specifically address any of his points and it comes off as extremely impersonal. I hope for RIM's sake they are sending around a much more detailed memo internally. For instance, the second sentence:

"It is obviously difficult to address anonymous commentary and it is particularly difficult to believe that a 'high level employee' in good standing with the company would choose to anonymously publish a letter on the web rather than engage their fellow executives in a constructive manner"

seems to just strengthen the original author's point 8