In other Microsoft news, they announced a deal to buy Placeware
which is one of the top 3 web conferencing companies in the US and a direct competitor to WebX.
Lots of B2B marketers use Placeware to do Webinars and online sales presentations to clients and prospects. The main "watch out" item from an email standpoint is that I've heard from several sources that users have to register with Placeware to get into the system for the first time, and Placeware definitely uses this as an opportunity to try to add to their own house email list. You are driving your traffic to their registration page where they will possibly get a name for their own use. When signing a deal with them, you may want to consider looking over that reg page and requesting changes if Placeware emails sent to your names might affect your brand negatively.