Previously, a non-IE browser, like Safari or Firefox, a user could choose to use the Simple HTML Editor, and then on the actual Send Email page, an error would be displayed, often times confusing the user. To avoid this confusion, we have now made it so that when using a non-IE browser, you will not be able to select the Simple HTML Editor.
Additionally, if your account is already set to use the Simple HTML Editor, and you login with a non-IE browser, the Send Email section will default to the Enhanced HTML Editor.
Additional Information for Techies:
The Simple HTML Editor is ActiveX based, and therefore only works with Internet Explorer. The Enhanced HTML Editor is a Java applet, and is therefore browser-independent.