We're not Microsoft's primary customer when it comes to considering Outlook. Neither is Travelocity, or pretty much anyone that would know what CSS even was, le

We're not Microsoft's primary customer when it comes to considering Outlook. Neither is Travelocity, or pretty much anyone that would know what CSS even was, let alone be unhappy about the rendering used for it (or even know what a rendering engine was). Their core customer is Janice from Accounting, who sits on the Party Planning committee at BigCo. and wants to send out an invite to the company's Thanksgiving Party, for which she has selected some excellent WordArt to use. It's Phil the low-level VB.net developer, whose idea of version control is sending an email to himself with a huge attachment every night so he can recover off that if need be. It's Stacy from HR, whose email signature is in a pink script font, so that we know she's given that email a personal touch when she "signs" it like that. That's who Outlook is designed for - big corporate offices, where all 90% of the people want is to be able to send colorful emails with a drag-and-drop toolbar using an interface they are already intimately familiar with. And by that standard, their customers probably love the decision to use Word's authoring engine, and will simply blame the people they got the email from when it doesn't look right. Think of it this way: if you even know this controversy exists, you're a more technical user than those which Outlook is designed for.