Did you try selecting a three-member panel?
I'm still not clear on how you see bias there. I'm not saying it isn't there, but if the panelist represents Microsoft, that might show bias if the domain is alleged to be infringing on Microsoft's marks. But if Microsoft "sells to" the complainaint, I guess I don't know what that means. Sells what?
The one thing here that makes me uncomfortable is "He also has arranged a forum for WIPO funded by the Complainant."
My guess is that he probably is not actually biased. Nevertheless, the proper functioning of any tribunal requires both a lack of impropriety and a lack of the mere appearance of impropriety.
I actually would like to see a provider implement a peremptory challenge procedure, whereby at least one panelist can be stricken by each party with or without cause. However, you'll be stuck with whoever you get as #2 unless you can actually show a reason to remove them.
Such a regime would likely shave off the panelists at both ends of the actual/perceived bias spectrum.
The Complainant filed and Additional submission 14 days after my response. 6 days after the panel assignment. Complainant has not yet paid for it so it's not official yet.
I am sure the Panelist will accept it.
I wonder why I even bother with UDRP.
I'll take them all to court and be done with them.
Taking them all to court is going to cost you a king's ransom.