Now, four of the clients will consistently display (Gmail, Outlook, Thunderbird, and Windows Mail), and we're working on bringing AOL, Hotmail, and Yahoo! Mail back to life.
The reason this tool is so difficult to maintain and service is because a) We coded this feature from scratch, and Inbox Rendering is an extremely difficult process from a software development perspective, and b) Webmail clients are constantly changing, and when a change is made to its login process or its interface, we have to re-code our app to render that client all over again.
