The messages still come through and all, but the icon is gone. I deleted it by accident. How can I get it back? Right now it just shows a boring old world one like my other email.
If the messages are coming through, you didn't "delete" it.
First check what ALL the email envelope icons read. The "Yahoo" icon is gone and Yahoo email addresses now have the generic envelope icon like the other email addresses.
If you don't see an icon with the name of your email address, then check to make sure you didn't hide the icon. On the main/home screen, press menu and select "Show All".
Look in ALL your folders including the Media folder and the Documents to Go folder.