Really, I can completely understand how frustrating it is for him.  There comes a point when you just get fed up with the same stupid questions that are caused by erroneous statements, both inadvertent and deliberate, from competitors.  I'm just not sure that any response at all is going to look like anything more than a knee-jerk reaction.  Honestly, I have never been good at dealing with unethical sales and public relations people, so I have absolutely no advice to give.

Reading his response from my point of view, his points seem to be on point and easy to understand.

What seems especially ironic about being attacked about the Notes/Domino roadmap is that the emperor has no clothes.  What's the comparative track record for Microsoft?

It's always fun to take a look at the carnage that is Microsoft's past collaboration offerings and broken promises.  If you replaced Microsoft and IBM with Company A and Company B, who in their right mind would ever believe ANYTHING that Company A promised?  Unfortunately for users and IT administrators, senior executives rarely look at the facts in this manner. 

Fortunately, relief is being provided by MS care of it's next version of Exchange.  Talk about slapping lip stick on a pig.  Their handling of the product reminds me a lot of the way Novell handled Netware in the mid-90's.  They believed that their market dominance would allow them to dictate to their customers instead of listening to their needs.  Time will only tell if MS will follow Novell down the path of destruction.  Think that can't happen?  In 1994, who would have ever thought that Novell would be in the shape that it is in today?  Something to chew on.