I guess that you should probably take the discussion offline, unless you come to agreement and post that.
There are some weak points on both sides, even if I mostly believe Florian Mueller is more trustworthy.
I believe that the authenticity of the mail is very reasonable - other interpretations require an impressive amount of paranoia IMHO.
Of course, we do not have a definitive proof - we (including you) could ask some authoritative by-then-subscriber on the FFII list, and he could publish a public statement. I guess the onus is more on than on us (would they care)?
I first interpreted mjw's comments to my article as a misreading of the article - he really seemed some random guy not understanding you.
Then, we finally see that he's a RedHat developer, against you because you attack RH:
> Your blog comes over as a anti-IBM/Red Hat/Google, pro-Microsoft
mjw, given this article by Jonathan Corbet , how comes you visit LWN? Given also  and the distribution terms of RHEL and its security patches (I can't find the discussion of them here on LWN.NET, unfortunately), your employer is not that trustworthy to me (and to much of the community, for that matter). Yes, I acknowledge it supports many OSS projects, but it's rewarded well enough for its effort.
There's no reason to believe Mueller is pro-Microsoft. For instance, Miguel de Icaza has made greater praise to Microsoft .NET and its license, but nobody would question his transparency. He just believes Microsoft is not _that_ evil - and I personally fail to contend his technical points on this.
On the other side, Mr. Mueller, while I have no reason to believe you are employed by Microsoft, and that would be enough for me, your answer to the issue in  seems a bit confusing to me.
There can be many legitimate reasons for you being unable to state who is funding you, and maybe I don't understand that post because I lack the context you reference (without a link). Yet, a sentence like "I'm not related to Microsoft but I can't disclose my employer/I am a freelance/whatever", maybe together with briefly reiterating the standard non-patent-related stuff about Microsoft's trust, would reduce the chance of being misunderstood, and give less space to critiques of your positions.
However, I would like to see you comment against the weaknesses of the MS Community Promise  with the same strength as OIN weaknesses. While  sees MS as a bogeyman, there are valid points there (which you implicitly acknowledge here ).
You complain more against OIN because it has a double face, which MS hasn't. Fine. Now MS might be doing something similar in its support to Mono, seemingly. Could you comment on that?
And even if you don't expect the current MS policy to change, we can't trust the _current policy_ of any company, since it is always volatile (I concede that MS being bought by somebody else is as likely as the Earth being hit by a comet). I see that the 'current policy' point is one of your main ones. However, I fail to see how Microsoft is doing better than Google in this regard, since Google is not suing anybody at all (just defending software patents).
Finally, the only comment about concrete OIN activity I've seen was about the purchase of the (supposed) OpenGL patents which Microsoft was selling. Of course, any OIN's protection on them still suffers from all OIN's flaws. Having said that, do you think that's at least something good? It would be good for you, I guess, to elaborate also on the good points of that, no matter how weak, to strengthen your position.