re: Android Vs. iOS Vs. Windows Phone 7: Enterprise Shootout
WP7 linked inboxes are NOT an all or nothing affair. In fact you can have MULTIPLE Linked Inboxes in WP7 Mango.
Your quibble with the WP7 Mango email system is as a result of you not knowing how to use it properly. You can have as many linked inboxes as you like on WP7, making it the most flexible email system of all the platforms.
So, for example, you can create one linked inbox for your Gmail and Yahoo, give it a name, and it becomes a linked inbox tile that can be pinned. This leaves your Outlook account which can be a second inbox with it's own tile. Play around with it and you'll see just how good it is!
What I often find disappointing is that authors of "shoot-out" type articles often don't know enough about all the systems to make a fair review, and this is just one example of not knowing how a feature works, therefore misinforming readers about the benefits of a particular system.